Whenever I can look up the Azalea bushed, if a leaf is up against another block, it twitches. This means it kind of fazes through the wall. It changes when you move. Also, the other side has a shadow.
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Thank you for your report!
We're tracking this issue in MC-213777, so this ticket is being resolved and linked as a duplicate.
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The technical name for this kind of glitch is 'z-fighting' and it's already been reported in MC-213777 \:)