I've often wondered about that, because I often see them used interchangeably (and not just here). But you're absolutely right. Here's a random site I found that explains it: https://www.difference.wiki/bevel-vs-bezel/

Is the similarity of the word the only reason they often get mixed up? I think another factor is that flat surfaces surrounded by an angled bevel are fairly common. For example. I just noticed that the bezel of one of my monitors is also beveled.

The bezel on my monitor has a bevel.

TIL. Thank you! Suddenly realizing I've had the words confused my whole life :S