When updating old maps or creating new maps, it show a weird visual glitch. It looks like grey stripes. I'm pretty sure this was already the case in 1.16 and it is still not working in 1.16.3.
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[media][media]
Hi!
Did you open this world in any snapshot versions? If so, which ones?

Duplicate of MC-179858, please follow the instructions in the moderator note on that report, and in the future, please be aware that using early development versions can corrupt your world.