Oak trees can grow big even with blocks above them.
When tree's grown it replaces blocks with tree trunk and branches. Even bedrock
Easiest way to reproduce - use ilmango's "Fast 4 Type Tree Farm (Acacia, Spruce, Birch, Oak)" with oak saplings
Not sure if i'm allowed to leave a link, ask me if needed
Thanks!
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is duplicated by 6
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https://www.youtube.com/watch?v=-g8Z45MdQwc
I was talking about this farm. Easiest way to reproduce bug
I guess that Minecraft won't detect whether there is a block above the Oak Sapling anymore but only a detection based on probability. So it won't prevent the Oak Sapling grow into a Large Oak Tree if any blocks exist above it, and if so, the Large Oak Tree will replace the block no matter what is it, even the Bedrock
Unable to reproduce growing dark oak normally.