On the Jobs tab what does the progress percentage show? For me, even with a powerful computer it takes several hours to complete the entire conversion from HEVC to ProRes. Sometimes it might show that one task is finished, but the progress as a whole hasn’t totally finished.
Try the command I posted instead of using hybrid. It works.
Doing the whole movie can take 8 or more hours depending on how fast your machine is.
Or do this! I’m a GUI man myself, but command line can be more robust if you know how to use it, and it looks like oohteedee definitely knows how!