I'm having some issues with the additional leaves textures, they appear completely flat, with only some noise as details.

I checked all in-game textures related to the mod, and only the additional leaves textures seem to have this issue. I reinstalled the mod manually and through the curseforge launcher.

Minecraft version: 1.16.5
Forge version: 36.1.20
Mod version: 2.6.5

Additional mods: Optfine G8, Kotlin for Forge 1.12.1, Kotlin Libraries 1.0-6, Dynamic Trees 0.10.0 Beta 14.

Is the any known mod incompatibility list, by the way?

Fixed. It was optifine forcing "default" on detail options, trees. Use Smart or Fancy to fix it.

kinda embarrassing i didn't think of this earlier tbh

Fixed. It was optifine forcing "default" on detail options, trees. Use Smart or Fancy to fix it.

kinda embarrassing i didn't think of this earlier tbh

No impact on performance noted after changing options, either on Smart or Fancy.