Max/Vray crashing when I switch to photometric lights

I’ve got a nighttime screet scene with streetlights and Phoenix water simulation. I’ve been rendering using V-Ray (v7) lights which render fine but produce lots of fireflies in the water. I was advised by Chaos support to try switching to photometric lights, but Max (2025) crashes every time I attempt a VFB render. I have shadows set to V-Ray shadows. Is there a known issue between 3DS Max Photometric lights and V-Ray rendering?

Native photometric lights are supported. It must be some combination causing it. Mind if you send the scene where the issue is reproducible so we can troubleshoot?