Help needed, Opera scene in 50Hz

A fellow swedish FF6 hacker? Gött mos!

It looks like the PAL patch specifically disables the functionality of the F9 event command in PAL mode in order to fix some issue with the ending:

Code:

.bank 0 slot 0
.org $9A4C

    .dw CheckMusic


.bank 0 slot 0
.org $fee8
.section "ending fix" overwrite

CheckMusic:
    lda.w $213f
    and.b #%00010000
    bne AdvanceOneEvent    ;dont check music if in pal mode(will crash otherwise)
    lda.b $eb
    cmp.w $2141
    beq AdvanceOneEvent
    rts
    
AdvanceOneEvent:
    jmp $B8C2

.ends

I don't know what the issue is that the PAL patch attempts to fix, but disabling this event command is clearly not the proper way to fix it. Sorry I can't be of more help!

EDIT: I found some references to the ending bug. It seems that if run in 50 Hz, fading to black tends to freeze the game. This was commonly seen in Gogo's part of the ending but could occur in other places as well. Also, running in 50 Hz could apparently also cause desynchronization between music and graphics in long cutscenes?