Hmmm... you're on to something there -- switching between maximized and windowed and back doesn't cause the issue to go away (also resizing by a tiny amount does not appear to fix it).
But the behavior does seem to go away below a certain size point (not particularly usable ones IMO, and resizing back up or maximizing above those points brings the issues right back again).
So, it seems to be a constant related to the size of the window -- it looks like anything at or above about 1891 x 1072 seems to cause it (not exactly that size, but that's the smallest size where I noticed it), and anything below 1713 x 910 seemed to not have that issue (again, not exact sizes, but that's where I noticed it).
Also, it seems like the two different menus have the issue appear at different sizes -- like I found a size between those two where the file menu was stable, but the materials menu was still bouncy IIRC.