The Extras for ending 6

[Weimar Pluto Knight VII]

Ok, I've been using gamefaqs to tell me what when to defeat Lavos to get all the endings now that I'm in a new game +. Okay, I did what one gamefaq said, so I was able to get ending 6 (the one where Tata goes to Magus's castle and sees Crono laughing at him) as soon I as I stepped back in 600 AD, but after the credits, the save state menu says I just got ending 5, and I when I go to save, it's like "You already got the extras for this ending." How do I get the extras for ending 6?

[Zechs]

Ok, you fought Lavos before getting the Hero's Medal.
You should have the Dark Ages Monster Data and Music Tracks 21-30.

[Weimar Pluto Knight VII]

That's ok, thanks. Yes, I found it on gamefaqs, although I had to do some digging. You have to find out Tata is not the legendary hero or something first. Well, I beat the Denadoro Mts. and beat Lavos again, and it worked. You can get the ending as soon as you return to 600 AD again, but the system file thingy seems to be bugged there, so you have to wait a bit, but before it's too late.

So far, that's the only bug in the PS version I've encountered. Not much of a problem.