Some of the later floors use randomized chests as a LOCA event which pointed to a list of items and probabilities rather than event data, which EA doesn’t like. I made a fix for it which lets you disassemble those chapters.
Re-assembling them is a bit different, because the Valni/Lagdou chapters use three codes which aren’t used in any of the normal chapters and aren’t in EA’s raw definitions - _0x2B21, 0x2B22 (some weird stuff) and _0x192A (a check for postgame status). You have to add those commands to the raw definitions in order to re-assemble those chapters.