I have an update for the Final Fantasy Origins issue. Now I don't know if that's how it's supposed to happen or not.
On that second set of credits that are supposed to appear, those background images are different from the ones I remember. I found out why.
Here's how it goes, when you finish the game the first time, on the 2nd set of credits you get a set of background images (that get added to your gallery), alongside the credits text. After that, you can start a new game and if you beat the game a second time, you'll get the 2nd set of images where the credits are supposed to appear (the saves I posted above).
I found a save at the last boss without beating the game, I saw the ending, got the credits images I AND the credit text showed up correctly too.
Here's the save at the ending:
https://www.sendspace.com/file/5wpdj2
I can't find a youtube video of anyone beating the game a second time on another emu or console, so I don't know if you are supposed to get the credits or not.
But I think you should because the 1st set of credits appear, why wouldn't the second one?