Probably, I think there is a problem with the unit you are loading.
Among those units, is there a unit that moves when it appears?
If the point where the unit moves is a non-movable tile such as a wall, the game crashes.
For example, if load this map into the prologue, seth will appear above the water.
Since seth can not move above water, the game crashes.
If you are using FEBuilderGBA, it is very easy to reproduce it by making 7z of ups data using File -> Menu -> problem reporting tool.
It includes multiple ups data and save data of the emulator, making debugging very easy.
I did not have time to advance the game till chapter 10.
For that reason,I did not actually check it in Chapter 10,
The coordinates of the destination of several units are walls.
Probably, I think this is a problem.