Resolution: Awaiting Response
Affects Version/s: Minecraft 18w06a, Minecraft 18w16a
Fix Version/s: None
See attached screenshot. Weirdly, it didn't only replace the bottom log of the tree, but also the one above that.
To reproduce (steps are this way because of
1. Create a new world with seed 7913388302499728605
2. /tp @p 1017 104 10157
3. Fly (don't teleport!) to 1017 65 9657
4. Look at the tree.