Maps in 20w17a are full of "static". It's difficult to describe. See the attached picture.
Assuming this is due to changes in how blocks are stored in the region files.
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Asteraoth
Thank you for your report!
We're actually already tracking this issue in MC-179858, so I've resolved and linked this ticket as a duplicate.
That ticket has already been resolved as Fixed. The fix will arrive in the next version or is already included in the latest development version of the game, you can check the Fix Version/s field in that ticket to learn more.
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