Player sinks when standing on powder snow block with leather boots at Y=254/255

At high altitudes 254 and higher even when wearing leather boots you sink in powdered snow.

Steps to Reproduce:

1. Place a powder snow block at Y=254
2. Equip leather boots
3. Stand on the powder snow

Observed Results:
Player sinks.

Expected Results:
Player should be able to stand on the powder snow.