Magma Cubes Float in Lava

When magma cubes enter lava or fall into it, they don't swim in the lava in any way, or even act like it's a block. They simply hover it and begin rapidly bouncing, though not like they normally do. They do not even submerge into the lava. Images may not be that good, but feel free to reproduce the bug by watching a magma cube enter the lava.