Same as above, beside that you can try to change the video decoder to h.264 in monnlight-qt settings. Maybe the HEVC/h.265 decoder is quirky
Still testing, the default is HEVC, and yes, is all garbled, but h.264 at 1080/60 lags and insert a couple of black frames.
It's not an issue for me actually, but as i said, i'm testing.
Before i report some kind of issue, i make sure that i've tried everything i know to solve it, or at least pinpoint the problem.
I'll back to you later.