I was tweaking the shader for the pyro, but after i cached. Mantra didn't render anything but pitch black
Since I was just tweaking the shader with the mantra_ipr, all of a sudden the cache didn't render also the pyro sim.
Can anyone help me? Is this a bug or what?

In the viewport it's still visible

I took a look at your hip file, and I'm getting the same issue. On first glance everything looks correct, but I didn't have much time to dig into it

I looked at it too and couldn't find anything wrong. Must be frustrating. Sorry I couldn't help more.