Azalea trees can spawn on top of other trees

Put the summary of the bug you're having here

What I expected to happen was...:
Azalea trees not to spawn on top of other trees

What actually happened was...:
Azalea tree spawned on top of a spruce tree

Steps to Reproduce:
1. Create a new world in 21w38a
2. Use the seed: -7278925848930483343
3. Go to the coordinates: -35 120 97