Balloon oak trees generate with an extra set of leaves offset from the trunk

The bug

Balloon oak trees sometimes generate with a second set of leaves offset by one or two blocks on all 3 axis. See attached screenshots. To reproduce:

Seed: 6780435899537189126
1 offset diagonally: /tp @p 170 102 39
2 offset diagonally: /tp @p 200 81 -618