In my case, I could not find a way to fix or override the biomes and trees at my airport.
I believe these are the same glitches as not being able to exclude default assets at specific areas…
It seems at some airports or small areas of the world the procedural/data driven assets are sticky (i.e: default autogen) and can’t be overridden or removed…
The Zendesk ticket I sent back in Feb did no seem to have been addressed as the issue is still there.
So I presume it’s not on the priority list since they have a lot of other things to do and fix.