When I was trying to grow a 4 block tree from all variants of saplings that allow you to grow them when placing 4 together does not work. Even when you try to bonemeal it or even increase the randomtickspeed in the world the 4 block trees do not grow they stay as saplings. But when you take a single jungle or spruce sapling and grow a 1 block tree it works.
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[Mod] Neko
Attach a picture of the trees you're trying to grow and the surrounding area. There may be obstructions in the way preventing it from growing.
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After a little bit of testing, it seems to be happening in the survival world that I've been playing throughout these recent snapshots. Cause I made a new creative world to test and it seemed to work just fine.
Chandler
Duplicate of MC-179909