Hmmm, I've noticed on my XF 150-600mm too, it's as if the profile corrections in Lightroom aren't properly matching the lens. I've not noticed it on any other lenses I own and use.

All of a sudden, I’m getting vignetting with both Fujifilm 18-135 and 55-200.  I don’t use lens hoods so that’s not the cause.  Thoughts anyone?

I am not getting any exposure indication on the scale on the left side of the screen when I install the XC15-45mm 3.5-5.6 lens on my X-T50. Is there a setting that might cause this? This doesn't happen with my 23mm f2 or 50mm f2.

Check for dust at the viewfinder‘s sensor and for a misaligned eyepiece. 

I have the same lens and the same problem. Has anyone been able to resolve this problem? Thanks.