How to reproduce:
1. Place 8 snow layers
2. Place a boat on top (This is to make the block land while above the snow)
3. Let a piece of falling scaffolding fall onto the block

Observed behaviour:
The scaffolding doesn't land on the snow layers and breaks

Expected behaviour:
The scaffolding should be able to land because 8 snow layers are a valid support for scaffolding

Simmilar issues occur when having supporting scaffoldings next to the block it tries to land in, if the block below doesn't support sand
Also technically affects pointed dripstone.