I’m pretty sure this used to work just fine but no longer does.
As you see the regular render works fine.
Maybe I’m having a stupid moment but can’t work it out 
It has always been like this because GPU IPR does not use LC. We have an improvement request already logged (internal bug-tracker id: VMAX-7928 ) for our developers to investigate.
Ah ok.
It was working in previous versions though, yes?