[Experimental] Azalea trees (not bushes) will sometimes generate underwater

Azalea trees (not bushes) will sometimes generate underwater.

Steps to Reproduce:

1. Create a new Caves and Cliffs world with the seed 961564595
2. /tp 688 54 -685

Observed Results:
An azalea tree generates underwater.

Expected Results:
Azalea trees should not generate underwater.

Screenshot: