Chopping a stripped log will make it use the stripped oak texture instead of its own. Also, sideways stripped logs will use the texture of an upright log when chopped (top left chopped log in picture).

All logs in this tree were either Acacia or Stripped Acacia before chopping.

Minecraft: 1.18.1
Forge: 39.0.59
Mods: TreeChop-1.18.1-0.15.5

Egads that’s ugly. Thanks for reporting, I’ll get it fixed