Top Snow cannot be placed on top of Cauldron and Composter. It is mentioned in the changelog, but it cannot be place.
How To Reproduce:-
Step 1:- Have one Composter and Cauldron.
Step 2:- Place them on the ground.
Step 3:- Have Top Snow.
Step 4:- Crouch and place 'Top Snow' on top of Cauldron and Composter.
It cannot be place.
It should be place on top mentioned like in the changelog.
Hoping this information is helpful to fix the bug.