Sulfur cubes float with coal blocks absorbed, and sink with snow blocks absorbed

This physics error causes the snow block (which is supposed to be a soft block) to sink with the sulfur cube, while the coal block (a heavy mineral) floats

Steps to replicate:

1.Place a sulfur cube in the water

2.Place a block of snow or coal depending on which one you want to try

3.Both blocks will behave as explained

Expected result:

Both blocks would be expected to respect their "real" properties to help players understand the sulfur cube

Real result:

The snow block will behave like a heavy block, while the coal block will behave like a soft block