I saw this mentioned in the Discord, but couldn't find any issues here for it. I noticed that leaves from Wisteria trees don't decay quickly with the Fast Leaf Decay mod. Looking at the code for both mods and similar issues reported in the FLD GitHub, it looks like the reason is because WisteriaLeavesBlock inherits directly from Block instead of LeavesBlock. I'm not familiar enough with Forge's API or the Environmental codebase to know if there is a specific reason for this, so I don't know if there would need to be a change in the FLD mod to explicitly support Wisteria leaves or if that's something that could be changed here.

I just released an update to FastLeafDecay which also checks the leaves BlockTag. Environmental trees are now supported. :-)