I don’t think they ever filmed anything with a force ghost to be cut… I thought it was just something thrown around in the early concept art?
I know there’s been talk about it definitely for ep8, where he is going to talk to Ren as force ghost>? From what I’ve read it was in the original script hance the concept art, so yes i don’t think it was actually filmed but it very nearly happened. If they are going to relate to the prequels which they will have to as they are now cannon, this doesn’t bode well for the restoration of the OUT.