Is seekforward and seekbackward supported for the picture in picture api on javascript on web?

Question

I'm have implemented the picture in picture function for my web project on angular.

This is the basic component for it.

export class PlayerPipComponent implements OnInit {
  @Input() video!: HTMLVideoElement;
  isPlayerErrorOpen = false;
  constructor(@Inject(DOCUMENT) private document: Document, private dialog: MatDialog) {}

  ngOnInit(): void {}

  async togglePip(): Promise<void> {
    try {
      if (this.document.pictureInPictureEnabled) {
        if (this.video !== this.document.pictureInPictureElement) {
          await this.video.requestPictureInPicture();
        } else {
          await this.document.exitPictureInPicture();
        }
      } else {
        this.showGeneralError('000', "This browser doesn't have Picture in Picture enabled.");
      }
    } catch (error) {
      console.log('Error', error);
      this.showGeneralError('000', error);
    }
  }

I was trying to add the controls for seekforward and seekbackward, but for some reason they don't seem to work on it. But the previoustrack and nexttrack controls work fine.

          navigator.mediaSession.setActionHandler('previoustrack', (details) => {
            // Go to previous track
            console.log('previostrack', details);
          });
          navigator.mediaSession.setActionHandler('nexttrack', (details) => {
            // Go to next track
            console.log('nextrack', details);
          });

Just adding these few lines, it shows the controls in the picture in picture. But if add these next ones, it doesn't show the seekbackward o forward controls.

          navigator.mediaSession.setActionHandler('seekbackward', function (details) {
            // Do something
          });

          navigator.mediaSession.setActionHandler('seekforward', function (details) {
            //Do something
          });

Does anyone know if they are just not supported? Or if you could point out what I'm doing wrong, I would be very thankful.