Angular Saving an Edited Content

[EDITED] When you interpolate your variable in the template and use contenteditable - it doesn't update your variable. You should update it manually.

<span contenteditable [textContent]="_stickerData?.StickerData" (input)="onStickerDataChange($event.target.innerHTML)">
</span>

and in TS should be something like this:

onStickerDataUpdate(data) {
    this._stickerData.StickerData = data;
}

Useful Links: 1, 2 [OLD RECOMMENDATIONS]

1. Are your sure that response has edited paragraph? If yes, Probably there is a problem with Change Detection. Import in component constructor ChangeDetectorRef and trigger markForCheck() method when getting data.
2. Nested subscriptions is a bad practice, try to refactor with switchMap()

This is a pseudocode to show the idea:

   class MyComponent {
      constructor(private cd: ChangeDetectorRef) {}
        
       save(){
         this.confirmDialogRef = 
         this._dialog.open(FuseConfirmDialogComponent, {
            disableClose: false,});
         this.confirmDialogRef.componentInstance.confirmMessage =
    "The paragraph will be changed";

         this.confirmDialogRef.afterClosed().pipe(switchMap(result) => {
           if (result) {
             return this._productionService.saveStickerData(this._stickerData);
           } else {
             return EMPTY;
           }
        }).subscribe((response) => {
          this._stickerData = response;
          this._messages.Show(            
             "SUCCESS",
             3
          );
          this.cd.markForCheck();
        });
      }
   }