Dark oak trees often generate incorrectly and float 1 or more blocks off the ground. To reproduce, /locatebiome a dark oak forest, and notice that many dark oak trees are floating.
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galaxy_2alex
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-610, which is a report that has not been resolved yet.
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gaspoweredpick
Didn't this happen later? I don't remember this issue happening in 1.14.4, and it doesn't happen above lakes, just randomly and very often.
migrated
I can confirm this issue for 1.16.4, but moreover I can probably confirm it's not a duplicate of MC-610 since this is just an issue in the tree generator. Explanation:
MC-610 is about grass and other vegetation being incorrectly positioned (and hence generating floating), but the tree isn't incorrectly positioned. The tree is supposed to generate on the ground, but grass prevents the tree from generating a layer of log blocks in the grass. This is due to a bug in the dark oak tree generator. A tree generator does several checks to prevent it from replacing any solid block. In all cases it checks whether the block can be replaced when it's one of the following conditions:
It's an air block
It's a block of leaves
It's a block with a plant material (MCP name: TALL_PLANTS) - these include grass, tall grass, ferns, etc.
It's a water block
Once a tree generator has checked for space it generates the log, checking these conditions for replacing blocks once again. However, the dark oak tree generator only checks air and leaves, and does not generate a trunk in plants or water.
I'm not sure whether this is covered by MC-610 but as far as I understood it isn't. This issue might have been introduced in 1.15 as Mojang divided tree generation into several separate parts (i.e. foliage placers, trunk placers, etc.). I would request this issue being opened again.
gaspoweredpick