Currently, persistent leaves (typically ones placed by the player) are not broken when felling. Some mods make leaves persistent so that they don't decay when not directly adjacent to other leaves blocks. For example, Biomes O' Plenty's palm leaves.

Either allow all persistent leaves to be broken, or configure breaking persistents on a per-block basis.

When #1 is implemented, we can consider creating special detection rules for specific log types

Closing. There's a config setting to enable breaking persistent leaves, and more specific cases are captured in other issues.

Actually, BOP's palm leaves still don't break because they're diagonally connected, which is the whole reason they're marked persistent in the first place.