Hello
What a funny logic here: Those coliders here casts shadow on the terrain, while the building and the trees don’t?!?
Why? Coliders haven’t render options to choose (cast and recieve shadow on or off)
The Terrain lightmapper is a ray tracer that uses colliders to determine what is in shade and what is not. Trees do not have mesh colliders so they don’t “cast” shadows. So before lightmapping disable the colliders that you don’t want to have cast shadows.
Or you could use this lightmapper instead: