In the latest snapshot textures seem to be glitching.
Player skin flickers between the texture/black depending on rotation.
Entities and some blocks have darkened textures, see screenshots.
Screenshots are from a newly generated world, but issue exists on all worlds.
Renamed .minecraft directory and re-installed, still persists.
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-186080.
Please use the search function in the future to prevent duplicate reports.
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