When you have a block above you while it is raining you will see the rain texture glitching into the other block's texture and it is like the rain is fading into the block.
Linked issues
duplicates 1
Comments 2
Thank you for your report!
We're actually already tracking this issue in MC-163575, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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Does MC-163575 describe your issue?