This bug triggers when a tree is getting cut off by the old generation, then it skaters the leaves in random places on the old generation. Im guessing this was supposed to be attached to the tree in attempt to make chunk blending smoother,but it ended up not working and results to it looking like it is in the photo.
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We're tracking this issue in MCPE-144937, so this ticket is being resolved and linked as a duplicate.
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It's still happening in the latest beta! And if you break the leaves and unload those chunks when you return more leaves will be there.