For the Oly it's unusual, maybe the attached picture is not that clear, I increased a little the contrast and saturation to make it more obvious.
I'm not sure why it would have issues with something so basic?
For the Fuji I suspect it's related to the x-trans pattern interpretation, particularly as it is present in the jpeg also. What I'm concerned about is that it might be introducing false detail while eating some that exists already.
If I'm willing to let this go than with Fuji I get sharpest shots. If the scene doesn't have movement then the high resolution E-M5ii shot is the best, quite clearly so.