Hi all! Has anyone been successful in getting Pyro FX Shelf Tools to render with the Karma ROP? (NOT Solaris/LOPs Network pipeline)

If I make a pyro sim from scratch (Pyro Source / Volume Rasterize Attributes / Pyro Solver / Pyro Bake Volume), both fire and smoke render great! (As long as I remember to apply the MtlX Pyro Preview material)

However, if I use any of the Shelf Tools and apply the MtlX Pyro Preview to them, most of the time they refuse to show up in the Karma Viewport and/or Mplay. (Or they'll show up, and then disappear again - it's extremely confusing!)

If I use SOP Create to import the same Shelf Tools into a LOPs Network, apply the MtlX Pyro Preview material THERE and then attach a ROP Render node, or a Labs Karma node, then everything renders great - so I know Karma CAN render the Shelf Tools, it just refuses to do so outside the LOPs Network.

Any suggestions? (BTW, if anyone wonders why I'm not using the LOPs Network/Solaris, it's because I'm teaching a beginners Houdini class, and didn't want to spring a whole new workflow onto my students halfway through the semester, when they've only just gotten somewhat used to the regular Houdini interface)