For the map designation, you need to use the OPCode map_designate or map_designate_ex (I don't know the difference), written like this:
Code:leti R60 [Value 1] leti R61 [Value 2] leti R62 00000000 leti R63 [Value 3] leti R64 00000000 map_designate(_ex) R60
Where:
Value 1 = Floor Number
Value 2 = Map Number
Value 3 = Map Layout
R60~64 can be whatever successive registers you like.
For your BB issues, I'm not entirely sure why it would be crashing. You can send me the quest file if you'd like and I'll take a look at it (or just export the script into a text file).
I should probably rewrite this to use another map as Forest is kind of aggravating as well.
<grand edit>:
Ah sorry my bad, I mistook it for
set_floor_handler
The difference between map_designate and map_designate(_ex) is, you can reassign maps (unless _ex is BB specific)
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