Horizontal lines appearing on my display (Ubuntu)

While working with my DELL XPS 13 laptop (shipped with Ubuntu), sometimes colored horizontal lines appear (I cannot recreate the beahvior, it seems random). I tried attaching an external monitor to see if the behavior pesists on the other monitor: nevertheless, it seems these lines don't appear anymore even on my laptop when an external monitor is attached.

I tried running a quick diagnostic test and no issue was found.

Any hint? See photo.

PC model:
Dell XPS 13 9320
OS: Ubuntu 22.04
Processor: 12th Gen Intel Core i7 1260Px16
RAM: 32 GB
Graphic: MESA Intel Graphics (ADL GT2)

Don't put attention on the info you see in the photo: they concern another post I was looking at, not my computer. I could take the photo in that moment as the issue suddenly appeared.