I¡¯ve used keyboard covers for years on previous Apple laptops and not had a problem. This is the first time I¡¯ve used a camera cover though and that MAY be what did it. Here are links to Apple¡¯s
support article about the issue, a related MacWorld article and one from PCMag about a class action suit specific to the M1 MacBook. Looks like these all go back to Fall 2021. Wish I had seen it sooner.