A physically more accurate sulfur cube

There were a few physically inconsistent points regarding the sulfur cube, so I'd like to propose some corrections.

First, since sulfur burns continuously, it would be more natural if the sulfur cube, once ignited, continued to burn indefinitely.

Also, it's a bit strange that the sulfur slime doesn't turn into a metal sulfide when it absorbs a metal block. It would be more accurate if the absorbed block disappeared after a few minutes, or turned into a metal sulfide and fell.

Finally, if a heavy block is placed inside, it should sink in water. Combining this with the second function, it might be possible to create a mechanism where it floats after a certain amount of time, so that could be added as well.