Snowy village library has floating snow layers

The library found on snowy villages include a few floating snow layers, i think a snow block should probably be placed below them.

Steps to Reproduce:
1. Create one or various worlds (use a random seed).
2. Find a snowy village with a library.
3. Observe it.

Observed Results:
There are snow layers floating around it.

Expected Results:
Snow blocks should probably be placed below the snow layer.