block monsters from spawning in trees

[Aoryen]

Simply block drifters from spawning on leaves, logs, etc.
I settled into the redwoods and built a large fence only to realize drifters were spawning in the trees and dropping straight into the base
The trees were lit up a while ago but it's honestly pretty immersion-breaking to come home in the middle of the night and see an entire forest glowing instead of dark shaded trees because it's the only thing that keeps the drifters out

[PhotriusPyrelus]

I thought Drifters (and, in fact, all entities) had to spawn on solid blocks, which do not include leaf or branchy blocks.