Sulfur Cube with a block inside still takes damage from any source of fire.

It appears that the sulfur cube dies from any source of ignition, just put a block inside the sulfur cube and light it.

Expected result: The sulfur cube resists the fire damage.

Actual result: The sulfur takes fire damage.

Pls fix this, it is annoying for some players to lose their bouncy sulfur cube.

P.D.: this bug also implies to the latest preview update.