When ever I look around and you pay attention to the sky you may see flickering light blue to dark blue. It been happening to me for a while and it's look weird. Most other games the sky are not like that which is an issue. It's on server, realm and single-player worlds. And it's even been giving me frame-rate drop ( fps drop around 2-4 frame ). This even affect the fog in the distance when zooming in.

Video Frame - 30fps
Recorder - Xbox Game Bar