Perhaps this is intentional, or maybe it's just me, but I've come across Terralith's "Yellowstone" biome very frequently in the official AOF5 EU server. Too frequently, I'd say.
I'm not at my computer, so I can't get more info/proof at the moment. (I'm not sure what "proof" would look like anyway?)

Here's an example of what leads me to believe that the biome is also generating "incorrectly":

(that's calcite)

I have not tested whether this issue exists in any other server / world.

EDIT: The trees generating in the Yellowstone biome, as in the screenshot above, is intended.