After completing every zone with all emeralds, I went on to play The Final Fight stage. Unfortunately I falied and got a Game Over. I tried to play the stage again, but all I got was the Try Again screen (hence I collected every emerald in the game). I had the possibility to play again this stage after I softreset the game. Can anyone tell me what's going on?
If anyone wants to try out this bug then here's the password with all emeralds and Final Fight unlocked: D L B 4 X H : 8 N V /
FIXED!