trees don’t fully generate between chunks, which probably has to do with chunks not checking for previously generated meshes. I can confirm that this happens with every tree variant, but I have not seen an example of this happen for acacia trees.
Seed for Attached Images: -1615413130
Attached: One picture shows two trees aligned on the same chunk. The other shows only one tree that generated with less than half of its blocks.
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Thanks for attaching the screenshots. It looks like you're experiencing MCPE-11908, so I will resolve and link this ticket as a duplicate of that.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
Can you attach a screenshot of the issue?