Yes, I think "spurious rotational energy" is what I am referring to.
As I mentioned, there are plenty of workarounds, but I want to understand this issue.

I do not share the opinion, that the mesh is too coarse at this location. In relation to the geometry dimensions I believe the model has a pretty good mesh resolution, especially because I am not trying to evaluate stresses. But anyway, here you go:
This seems to be not a mesh related issue (tetrahedrons for Washer):

I am solely here to understand what & why this is happening.