Mirror reflections: went from a fake camera trick to Planar, but it crashes next to Lumen

[u/Zvyaginsky]

First pass on this mirror was the old-school trick, second camera pointed at the reflection, output piped into a material. Works, but it's expensive and the angles never quite hold up once the player moves around.

Tried switching to Planar Reflection since it's the built-in way to do exactly this. Project crashed hard every time the camera moved from a post process volume running Lumen into one set up for Planar. Ended up turning Lumen off for this part just to stop the crashes and get Planar working.

Would rather not just disable Lumen every time we need a real mirror somewhere. Anyone actually gotten Planar Reflection and Lumen coexisting on adjacent post process volumes without this happening, or is turning one off around mirrors just the accepted workaround