Map can't load...size problem?

Map 4 with tilemaps A9 and F5 loads without problem, but the other 3 always crash the game. Then I started experimenting a bit and exchanged tilemap A8 (the layer 2 tilemap of map 1) with tilemap 12E, and all of a sudden it worked! The game now loaded the map normally, despite the two tilemaps A8 and 12E being identical. So it almost seems like the game doesn't like certain tilemaps, and perhaps that's why they went unused in vanilla? Either that, or there's definitely something buggy going on here... Can individual tilemaps somehow become corrupted?

I don't know what could cause this.. Hopefully when I fix the tilemap saving bug you'll be able to use those above $15F. I hate releasing a buggy editor and I hate even more the fact that people are wasting time with it and lose time because of me.. I'm tempted to just remove it from the wiki but first I'll try to address the tilemap saving bug.. Thanks for reporting those things.