When generating the textures for leaves on dynamic trees using a resource pack, they simply lack color. The OptiFine custom colors, swamp colors, biome blending, and connected textures options have no effect on this. It works just fine with no resource pack, as seen below, and it only appears to affect jungle, acacia, spruce, and dark oak leaves. No other dynamic trees are affected by this (dtquark and dttraverse in this instance). I had thought that it may have been a conflict with Serene Seasons applying seasonal color changes, but after removing it the issue persisted.

Is there a fix you could recommend that I can do on my end (regarding the resource pack itself) or is this something currently out of my hands?

Forge: 36.1.2
Better Foliage: 2.6.5-forge
Resource pack: Mizuno's 16-craft 1.16.5 Java Edition
OptiFine: HD U G8

(Tree order in the following images:
Acacia, Dark Oak, Jungle
Birch, Oak, Spruce)

with resource pack

without resource pack

Comparing vanilla trees with DT trees, with resource pack

without resource pack

Better Foliage 2.7.0 for Forge has completely fixed these issues, thank you so much!