HTML not interpreted in Angular template

It has been several days since I am stuck on a problem that I do not see where it can come from.

I currently retrieve the content of my article in an observable and I loop over it in the angular template. So far I have no problem I get my information well that I display but the HTML is not interpreted with an innerHTML, nor with a pipe using the DomSanitizer.

I tried to store the information of my observable in a table to see if it does not come from the asynchronous but no.

I saw that it was necessary to use the DomSanitizer to force the security because when the string that contains the HTML is too long (which is my case because it is long paragraphs), the innerHTML has not no effect.

The string fits well in my pipe because when I make a console.log of my variable containing the string, it shows me well in my console with HTML tags around.

If you have any idea where my problem may come from, knowing that I have no errors in the console.

Here is my code without the pipe and HTML not interpreted :

<div *ngFor="let article of informationsArticle|async;">

      <div [innerHTML]="article.contenu_part1" *ngIf="article.contenu_part1"></div>

</div>

With the pipe and HTML not interpreted:

<div *ngFor="let article of informationsArticle|async;">

      <p [innerHTML]="article.contenu_part1 | keepHtml" *ngIf="article.contenu_part1"></p>

</div>

The pipe code :

import { Pipe, PipeTransform } from '@angular/core';
import { DomSanitizer } from '@angular/platform-browser';

@Pipe({ name: 'keepHtml', pure: false })
export class EscapeHtmlPipe implements PipeTransform {
  constructor(private sanitizer: DomSanitizer) {
  }

  transform(content) {
    return this.sanitizer.bypassSecurityTrustHtml(content);
  }
}

I added it in "declarations" of app.module.ts file as well as its import at the top of the file.

Rendering the source code in the console :