As of 46.3 or when ever.

When Plutonium undergoes a fission reaction by massive pressure and what not

The Lava created no longer turns to Stone, it now stays as "liquid plutonium"

I don't really know if this is a problem, or a glitch or a fix or what not, but I did like it when there was stone.

This sort of distorts realism and conservation of matter, being able to fiss plutonium again, after already "fissing"

@Candunc
the recycling ratio from liquid plutonium back to fissile plutonium is like 1/4 of your starting amount, the other 3/4 is converted to neutrons and uranium