I generated a world and noticed that a dead bush generated on top of a dark oak plank in a Badlands mineshaft.
This appears most likely related to MC-237800
Seed: -5904399010103670015
Coordinates: 2592 70 -177
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Dupe of MC-237800
As of 1.20 Pre-release 1, this issue is fixed. Fixed, as in, all three dark oak planks simply don't generate anymore, making the bush also not generate. See newly attached image.
I'm not sure if the mineshaft not generating the planks would itself be considered a bug however.