imagePlane affected by environment override?

Hmm, I’ve gotten badly sidetracked trying to figure out some matchmoving issue, so I’ll get back on this when I can.
If you get a chance to look back through anything that would be useful but as you mentioned there are a few files here and there which are meant to show it working correctly. I think I just had issues trying to replicate as I didn’t understand where certain things went etc.