Following changes during the 20w22a snapchot.
All my entities are provided dark even on a new world, this problem had never happened to me in later versions and I have a recent Windows 10 computer.
So I don't see the problem if it comes from me.
Sincerely, hoping that you solve this graphical problem.
Thank you for your report!
We're tracking this issue in MC-186080, so this ticket is being resolved and linked as a duplicate.
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