This appears to be intended, I don't remember the percent sign ever working in seeds or world names.
Can confirm that it is a working bug on a iPad Mini 4 and a Samsung Tab 4.
This appears to be an intended feature, since to look at enchanted items before was very hard since the list of enchants would go past the screen border, and be cut off. Also, it resembles PC much more now.
Can confirm that this is a working bug on a Samsung Tab 4.
Well, it wasn't included in the change log, and something that was just fine doesn't make sense to be changed like that. I'm gonna assume this is a bug/glitch.
I have the same issue, running exact same software as you. Considering all other versions used white cursors and colons for the game, it seems odd that all the sudden they would change to such a color as ORANGE, not white or black.
I can agree with Connor in that the issue still hasn't been fixed in 1.2.8.