Lava eats more than rings!

Somehow I was not expecting this, but I'm now running into an issue where SRB2's lava is eating not just rings (intended behavior I disagree with), but now it's also eating custom fire based hazards. Recently I tried remaking the old mario fire ball and placed it in lava only to have it not show up. After further testing I discovered that the lava was destroying the remade fireball too!

I also double checked to see if this happened with flame throwers too, and it does.

This second picture has the flame thrower in the lava.

Is there some sore of white list for what flags a thing needs to not be destroyed by lava?