Odd yellow "smudge" in empty comp

So here's a weird one:

I'm not sure I'd call this a bug, since it really doesn't affect anything that I can see, but it is strange.  I'm using AE 2021 (18.4.1) on Windows 10, and when I create a new 1920x1080 comp, I get a weird yellow smudge in the bottom right area of the comp.  

It only shows up when the comp is empty.  I created a solid and masked it out so it wasn't overlapping the smudge, and doesn't show up.  Now, I did try different frame rates for the 1080 comp, and it seems to be there in all of them.  However, it does not show up for 720 or 4K comps.

I rendered an .AVI of the empty comp, and the smudge is there.  Again, it doesn't seem to affect anything since it goes away when I add anything to the comp.  Just thought it was weird.  Hopefully it's not a precursor to something worse.