Pale oak trees with creaking hearts (and probably regular ones too) do not generate perfectly symmetrically.

Pale oak trees with creaking hearts (and probably regular ones too) do not generate with perfect symmetry when it comes to possible positions of leaves.

Attached are two screenshots, a mass of all possible locations that pale oak leaves can generate when a tree is created, and a version that reconstructed with wool for added clarity (black=4 block column, brown=5, red=6, orange=7)

To observe, create a chain of command blocks going upward (first repeating, rest chain), activate it, then tick sprint a few days. Commands marked with # are ones I used that should not be necessary to achieve the effect

fill ~4 ~-10 ~4 ~16 ~12 ~16 air
place feature minecraft:pale_oak_creaking ~10 ~ ~10
clone ~5 ~-1 ~5 ~15 ~10 ~15 ~20 ~-1 ~5 filtered minecraft:creaking_heart
clone ~5 ~-1 ~5 ~15 ~10 ~15 ~5 ~-1 ~20 filtered minecraft:pale_oak_log
clone ~5 ~-1 ~5 ~15 ~10 ~15 ~20 ~-1 ~20 filtered minecraft:pale_oak_leaves
fill ~19 ~-5 ~19 ~31 ~5 ~31 pale_oak_leaves[persistent=true] replace minecraft:pale_oak_leaves[persistent=false]
kill @e[type=item]