Patch: Battle Dialog Page Break

Just to give some sort of a visual aid or way to test this to show what kamesennin is talking about:
https://www.youtube.com/watch?v=T2XmOYmn3h8

You'll notice upon reaching the end of the 4th line, the garbage white tiles suddenly appear just outside the left of the dialog box, which is actually part of the 'a' character that was used for this testing, meaning if I used another character such as 'b' it would appear different - it's the last character used in the line in other words.

If you remove background layer 2, it is actually all across the screen as well:
https://imgur.com/kStUonh

If there was just one less 'a' character in that 4th/8th/12th line, this bug does not happen and all would appear fine:
https://imgur.com/Nbk7J0O

Note that for lines 1-3 all the 'a' characters could be removed and the bug would still happen upon reaching the 4th line, so it seems to be related to that new box line and none of the others:
https://imgur.com/2jhF3tM

It seems to happen only upon reaching the 4th/8th/12th etc. line, which in ff3usme shows it as making a new dialog box:
https://imgur.com/ZOznqOj

It seems sort of random to actually get it to happen, meaning it's not a certain amount of characters or a specific character...

I'm not sure if it's some vram overflow issue, but that'd be my guess. I also didn't test if this patch would fix this, but I'd imagine not.
And sorry if my attempted method of showing this issue makes no sense at all. I remember this issue happening for me looooong ago when I was first working on my hack, and I would just shorten the line 4/8/12 etc. until it would no longer bug out.