When generating a world, tall grass can block/destroy the bottom 1-2 blocks of dark oak trees. This happens pretty commonly when dark forests and plains biomes border each other.
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[Mod] markderickson
Hi there!
I think this is a duplicate of MC-125483. If you don't think it is, please provide the world seed and coordinates of this so that others can take a look at this. If you don't know how to do this, it's /seed.