diff --git a/client/src/app/core/repositories/agenda/item-repository.service.ts b/client/src/app/core/repositories/agenda/item-repository.service.ts
index 66b22f596..b6ad5e431 100644
--- a/client/src/app/core/repositories/agenda/item-repository.service.ts
+++ b/client/src/app/core/repositories/agenda/item-repository.service.ts
@@ -143,7 +143,7 @@ export class ItemRepositoryService extends BaseHasContentObjectRepository<
 
     /**
      * TODO: Copied from BaseRepository and added the cloned model to write back the
-     * item_number correctly. This must be reversed with #4738 (indroduced with #4639)
+     * item_number correctly. This must be reverted with #4738 (indroduced with #4639)
      *
      * Saves the (full) update to an existing model. So called "update"-function
      * Provides a default procedure, but can be overwritten if required
@@ -152,6 +152,7 @@ export class ItemRepositoryService extends BaseHasContentObjectRepository<
      * @param viewModel the view model that the update is based on
      */
     public async update(update: Partial<Item>, viewModel: ViewItem): Promise<void> {
+        (<any>update)._itemNumber = update.item_number;
         const sendUpdate = viewModel.getUpdatedModel(update);
         const clone = JSON.parse(JSON.stringify(sendUpdate));
         clone.item_number = clone._itemNumber;
diff --git a/client/src/app/core/repositories/agenda/list-of-speakers-repository.service.ts b/client/src/app/core/repositories/agenda/list-of-speakers-repository.service.ts
index c3f918d8b..377ae5796 100644
--- a/client/src/app/core/repositories/agenda/list-of-speakers-repository.service.ts
+++ b/client/src/app/core/repositories/agenda/list-of-speakers-repository.service.ts
@@ -125,7 +125,7 @@ export class ListOfSpeakersRepositoryService extends BaseHasContentObjectReposit
             // TODO: This can be resolved with #4738
             const item = this.itemRepo.findByContentObject(titleInformation.contentObjectData);
             if (item) {
-                (<any>titleInformation.title_information).agenda_item_number = item.item_number;
+                (<any>titleInformation.title_information).agenda_item_number = () => item.item_number;
             }
 
             return repo.getListOfSpeakersTitle(titleInformation.title_information);
diff --git a/client/src/app/core/repositories/base-is-agenda-item-and-list-of-speakers-content-object-repository.ts b/client/src/app/core/repositories/base-is-agenda-item-and-list-of-speakers-content-object-repository.ts
index d9481cdbb..40e4b960e 100644
--- a/client/src/app/core/repositories/base-is-agenda-item-and-list-of-speakers-content-object-repository.ts
+++ b/client/src/app/core/repositories/base-is-agenda-item-and-list-of-speakers-content-object-repository.ts
@@ -54,7 +54,7 @@ export abstract class BaseIsAgendaItemAndListOfSpeakersContentObjectRepository<
 
     public getAgendaListTitle(titleInformation: T): string {
         // Return the agenda title with the model's verbose name appended
-        const numberPrefix = titleInformation.agenda_item_number ? `${titleInformation.agenda_item_number} · ` : '';
+        const numberPrefix = titleInformation.agenda_item_number() ? `${titleInformation.agenda_item_number()} · ` : '';
         return numberPrefix + this.getTitle(titleInformation) + ' (' + this.getVerboseName() + ')';
     }
 
@@ -63,7 +63,7 @@ export abstract class BaseIsAgendaItemAndListOfSpeakersContentObjectRepository<
     }
 
     public getAgendaSlideTitle(titleInformation: T): string {
-        const numberPrefix = titleInformation.agenda_item_number ? `${titleInformation.agenda_item_number} · ` : '';
+        const numberPrefix = titleInformation.agenda_item_number() ? `${titleInformation.agenda_item_number()} · ` : '';
         return numberPrefix + this.getTitle(titleInformation);
     }
 
diff --git a/client/src/app/core/repositories/base-is-agenda-item-content-object-repository.ts b/client/src/app/core/repositories/base-is-agenda-item-content-object-repository.ts
index 3255dc42a..965ce9985 100644
--- a/client/src/app/core/repositories/base-is-agenda-item-content-object-repository.ts
+++ b/client/src/app/core/repositories/base-is-agenda-item-content-object-repository.ts
@@ -79,7 +79,7 @@ export abstract class BaseIsAgendaItemContentObjectRepository<
      */
     public getAgendaListTitle(titleInformation: T): string {
         // Return the agenda title with the model's verbose name appended
-        const numberPrefix = titleInformation.agenda_item_number ? `${titleInformation.agenda_item_number} · ` : '';
+        const numberPrefix = titleInformation.agenda_item_number() ? `${titleInformation.agenda_item_number()} · ` : '';
         return numberPrefix + this.getTitle(titleInformation) + ' (' + this.getVerboseName() + ')';
     }
 
diff --git a/client/src/app/core/repositories/motions/motion-repository.service.ts b/client/src/app/core/repositories/motions/motion-repository.service.ts
index 0e32fa2cc..a9e10c5ec 100644
--- a/client/src/app/core/repositories/motions/motion-repository.service.ts
+++ b/client/src/app/core/repositories/motions/motion-repository.service.ts
@@ -252,7 +252,7 @@ export class MotionRepositoryService extends BaseIsAgendaItemAndListOfSpeakersCo
     };
 
     public getAgendaSlideTitle = (titleInformation: MotionTitleInformation) => {
-        const numberPrefix = titleInformation.agenda_item_number ? `${titleInformation.agenda_item_number} · ` : '';
+        const numberPrefix = titleInformation.agenda_item_number() ? `${titleInformation.agenda_item_number()} · ` : '';
         // if the identifier is set, the title will be 'Motion <identifier>'.
         if (titleInformation.identifier) {
             return numberPrefix + this.translate.instant('Motion') + ' ' + titleInformation.identifier;
@@ -262,7 +262,7 @@ export class MotionRepositoryService extends BaseIsAgendaItemAndListOfSpeakersCo
     };
 
     public getAgendaListTitle = (titleInformation: MotionTitleInformation) => {
-        const numberPrefix = titleInformation.agenda_item_number ? `${titleInformation.agenda_item_number} · ` : '';
+        const numberPrefix = titleInformation.agenda_item_number() ? `${titleInformation.agenda_item_number()} · ` : '';
         // Append the verbose name only, if not the special format 'Motion <identifier>' is used.
         if (titleInformation.identifier) {
             return `${numberPrefix}${this.translate.instant('Motion')} ${titleInformation.identifier} · ${
diff --git a/client/src/app/core/repositories/topics/topic-repository.service.ts b/client/src/app/core/repositories/topics/topic-repository.service.ts
index 148833c3b..188d4df41 100644
--- a/client/src/app/core/repositories/topics/topic-repository.service.ts
+++ b/client/src/app/core/repositories/topics/topic-repository.service.ts
@@ -52,8 +52,8 @@ export class TopicRepositoryService extends BaseIsAgendaItemAndListOfSpeakersCon
     }
 
     public getTitle = (titleInformation: TopicTitleInformation) => {
-        if (titleInformation.agenda_item_number) {
-            return titleInformation.agenda_item_number + ' · ' + titleInformation.title;
+        if (titleInformation.agenda_item_number()) {
+            return titleInformation.agenda_item_number() + ' · ' + titleInformation.title;
         } else {
             return titleInformation.title;
         }
diff --git a/client/src/app/shared/models/agenda/item.ts b/client/src/app/shared/models/agenda/item.ts
index 0dfea7598..80c8ff6ae 100644
--- a/client/src/app/shared/models/agenda/item.ts
+++ b/client/src/app/shared/models/agenda/item.ts
@@ -30,7 +30,7 @@ export class Item extends BaseModelWithContentObject<Item> {
     public set item_number(val: string) {
         this._itemNumber = val;
         if (this._titleInformation) {
-            this._titleInformation.agenda_item_number = this.item_number;
+            this._titleInformation.agenda_item_number = () => this.item_number;
         }
     }
     public get title_information(): object {
@@ -38,7 +38,7 @@ export class Item extends BaseModelWithContentObject<Item> {
     }
     public set title_information(val: object) {
         this._titleInformation = val;
-        this._titleInformation.agenda_item_number = this.item_number;
+        this._titleInformation.agenda_item_number = () => this.item_number;
     }
     public comment: string;
     public closed: boolean;
diff --git a/client/src/app/site/base/base-view-model-with-agenda-item.ts b/client/src/app/site/base/base-view-model-with-agenda-item.ts
index cbe027892..0e239eb78 100644
--- a/client/src/app/site/base/base-view-model-with-agenda-item.ts
+++ b/client/src/app/site/base/base-view-model-with-agenda-item.ts
@@ -22,7 +22,7 @@ export function isBaseViewModelWithAgendaItem(obj: any): obj is BaseViewModelWit
 }
 
 export interface TitleInformationWithAgendaItem extends TitleInformation {
-    agenda_item_number?: string;
+    agenda_item_number?: () => string;
 }
 
 /**
@@ -58,7 +58,7 @@ export interface BaseViewModelWithAgendaItem<M extends BaseModelWithAgendaItem =
 export abstract class BaseViewModelWithAgendaItem<
     M extends BaseModelWithAgendaItem = any
 > extends BaseProjectableViewModel<M> {
-    public get agenda_item_number(): string | null {
+    public agenda_item_number(): string | null {
         return this.item && this.item.item_number ? this.item.item_number : null;
     }
 
diff --git a/client/src/app/site/topics/models/view-topic.ts b/client/src/app/site/topics/models/view-topic.ts
index 0bbdb9407..0643dba2e 100644
--- a/client/src/app/site/topics/models/view-topic.ts
+++ b/client/src/app/site/topics/models/view-topic.ts
@@ -7,7 +7,7 @@ import { ViewMediafile } from 'app/site/mediafiles/models/view-mediafile';
 
 export interface TopicTitleInformation extends TitleInformationWithAgendaItem {
     title: string;
-    agenda_item_number?: string;
+    agenda_item_number?: () => string;
 }
 
 /**
diff --git a/client/src/app/slides/agenda/item-list/item-list-slide-data.ts b/client/src/app/slides/agenda/item-list/item-list-slide-data.ts
index 65a85da3c..e25d8b089 100644
--- a/client/src/app/slides/agenda/item-list/item-list-slide-data.ts
+++ b/client/src/app/slides/agenda/item-list/item-list-slide-data.ts
@@ -1,5 +1,10 @@
 export interface SlideItem {
-    title_information: object;
+    title_information: {
+        collection: string;
+        depth: number;
+        _agenda_item_number: string;
+        agenda_item_number: () => string;
+    };
     collection: string;
     depth: number;
 }
diff --git a/client/src/app/slides/agenda/item-list/item-list-slide.component.ts b/client/src/app/slides/agenda/item-list/item-list-slide.component.ts
index f1ed6efc4..5d040d732 100644
--- a/client/src/app/slides/agenda/item-list/item-list-slide.component.ts
+++ b/client/src/app/slides/agenda/item-list/item-list-slide.component.ts
@@ -1,7 +1,9 @@
-import { Component } from '@angular/core';
+import { Component, Input } from '@angular/core';
 
 import { CollectionStringMapperService } from 'app/core/core-services/collection-string-mapper.service';
+import { SlideData } from 'app/core/core-services/projector-data.service';
 import { isBaseIsAgendaItemContentObjectRepository } from 'app/core/repositories/base-is-agenda-item-content-object-repository';
+import { ProjectorElement } from 'app/shared/models/core/projector';
 import { BaseSlideComponent } from 'app/slides/base-slide-component';
 import { ItemListSlideData, SlideItem } from './item-list-slide-data';
 
@@ -11,6 +13,20 @@ import { ItemListSlideData, SlideItem } from './item-list-slide-data';
     styleUrls: ['./item-list-slide.component.scss']
 })
 export class ItemListSlideComponent extends BaseSlideComponent<ItemListSlideData> {
+    @Input()
+    public set data(value: SlideData<ItemListSlideData, ProjectorElement>) {
+        value.data.items.forEach(
+            item => (item.title_information.agenda_item_number = () => item.title_information._agenda_item_number)
+        );
+        this._data = value;
+    }
+
+    public get data(): SlideData<ItemListSlideData, ProjectorElement> {
+        return this._data;
+    }
+
+    private _data: SlideData<ItemListSlideData, ProjectorElement>;
+
     public constructor(private collectionStringMapperService: CollectionStringMapperService) {
         super();
     }
diff --git a/openslides/agenda/projector.py b/openslides/agenda/projector.py
index 9443acffc..0ee13e5a0 100644
--- a/openslides/agenda/projector.py
+++ b/openslides/agenda/projector.py
@@ -49,7 +49,7 @@ async def get_flat_tree(all_data: AllData, parent_id: int = 0) -> List[Dict[str,
         for item_id in item_ids:
             item = all_data["agenda/item"][item_id]
             title_information = item["title_information"]
-            title_information["agenda_item_number"] = item["item_number"]
+            title_information["_agenda_item_number"] = item["item_number"]
             tree.append(
                 {
                     "title_information": title_information,
@@ -78,7 +78,7 @@ async def item_list_slide(
         for item in await get_sorted_agenda_items(all_data):
             if item["parent_id"] is None and item["type"] == 1:
                 title_information = item["title_information"]
-                title_information["agenda_item_number"] = item["item_number"]
+                title_information["_agenda_item_number"] = item["item_number"]
                 agenda_items.append(
                     {
                         "title_information": title_information,
diff --git a/tests/unit/agenda/test_projector.py b/tests/unit/agenda/test_projector.py
index 0e1458292..0f86a54ca 100644
--- a/tests/unit/agenda/test_projector.py
+++ b/tests/unit/agenda/test_projector.py
@@ -95,11 +95,11 @@ async def test_main_items(all_data):
         "items": [
             {
                 "collection": "topics/topic",
-                "title_information": {"title": "item1", "agenda_item_number": ""},
+                "title_information": {"title": "item1", "_agenda_item_number": ""},
             },
             {
                 "collection": "topics/topic",
-                "title_information": {"title": "item2", "agenda_item_number": ""},
+                "title_information": {"title": "item2", "_agenda_item_number": ""},
             },
         ]
     }
@@ -116,17 +116,17 @@ async def test_all_items(all_data):
             {
                 "collection": "topics/topic",
                 "depth": 0,
-                "title_information": {"title": "item1", "agenda_item_number": ""},
+                "title_information": {"title": "item1", "_agenda_item_number": ""},
             },
             {
                 "collection": "topics/topic",
                 "depth": 1,
-                "title_information": {"title": "item4", "agenda_item_number": ""},
+                "title_information": {"title": "item4", "_agenda_item_number": ""},
             },
             {
                 "collection": "topics/topic",
                 "depth": 0,
-                "title_information": {"title": "item2", "agenda_item_number": ""},
+                "title_information": {"title": "item2", "_agenda_item_number": ""},
             },
         ]
     }