I'm not sure if this is still around in beta 14, but I know it's in b12d...
Anyways, I believe there is a palette bug in b12d. I was redoing the overworld in one of my quests (I still am), and decided to delete all of map 8. Before I started redoing my overworld, this map contained a minidungeon, which I am also redoing. Anyways, it uses the GCBZ Tileset, so the dungeon used the Face Shrine palette. When I looked at one of the screens, all tiles that used the purple colors in the palette had black instead of purple. I thought the quest got corrupted somehow, until I remembered palette cycling. Sure enough, the palette had some cycled colors! Now, I know that there's many things wrong with the CGBZ Tileset when you first import it (Cave screens have odd "Flag 133" flags, no sprites set up, etc.), but when I first made that dungeon (and tested it in 2.10), the palette was fine. Now that I'm using 2.11b12d, I found that many palettes had cycled colors. However, something tells me it may be a part of that Interpolated Fading bug... But still, I'm posting it here, just in case it isn't. And for all I know, it may have been reported and fixed already. But I don't know, so I'm posting anyways. Thanks for hearing me out. (And please don't bring up a "Don't use CGBZ" discussion again. Not only have I not had one in a long time, but I don't want to listen to anyone who tells me not to use it.)