Add one more to the list. I have a 2021 and just started hearing the same thing. It's inconsistent, but regular...meaning I hear it a lot now, but it's not always when I go over a bump...sometimes it seems to do a small knock even when I make a turn. It's almost like it's something hard that is on a wire or cable...and so if you hit a bump it makes the noise, or if you even turn the car the weight makes it hit something. But it's a solid knock...like mentioned above, it's like it's plastic on plastic or plastic on metal...
I can tell it's going to be one of those things that probably super easy to fix, if you can just find it.