I know that you expect it to cool into lava. But really, does lava cooling into lava make sense? I don't see what description would apply other than "buggy" if lava could do that.


Also, technical details on why it isn't broken in the way you expect:

When lava solidifies, type gets set to ctype and ctype gets cleared. So it turns into LAVA (NONE), which then solidifies into stone.

At least, that's what happened in v45.2. In the current version, Powder Toy checks for ctype==lava and skips the intermediate step, turning it straight into stone.