Problem. Spy_Dragon brought to my attention another difference between PSX and PC. The field Lastmap is different in PC to PSX. In PSX Holy appears on its own with no background at first, as Cloud sees the light. Then the background appears. You can see by comparing the 2 fields how their backgrounds differ to achieve this effect (from what I can see, the PSX parameter 3 state 0 blocks out the background?).
Unfortunately, importing the script and background from PSX to PC does not work. The PC game either can't display the information like the PSX can or, more likely, the import isn't working right.
Is there any way to import a background properly from PSX to PC? Or even check whether this is indeed the issue?