Warden spawns in blocks that have no collision

The warden can spawn on blocks that it won't be able to stand on, therefore, immediately falling though.

 

How to reproduce:

1. Create a space devoid of nearby blocks.
2. /fill an area with any blocks that don't have collision (i.e. sculk veins).
3. Use a shrieker with can_summon set to true to summon the warden naturally.
4. The warden successfully spawns in the area.