Sulfur cubes spawned in previous versions no longer function correctly

After installing the Chaos Cubed update, pre-existing sulfur cubes from experimental worlds no longer function as expected. Ones created afterward aren’t affected.

• Their top face doesn't use the contained block’s texture

• They cannot be sheared or given new blocks to absorb.

• They no longer collide with the player or with other bugged sulfur cubes, and you can walk straight through them as if they aren’t even there, and they will not be pushed when doing so.

• They won’t hurt mobs if they contain a magma block.