The first chapter doesn’t want to run a battle event.
Put the fade-out release (ASMC ShowMap or FADU) before the event battle.
This is the same phenomenon as Q04 in CTF.
The first chapter also stops the music after entering a battle.
This is because you are using wav BGM.
If you are using a special sound source that makes BGM with a single wav, the song will not play back well continuously.
When GBAFE switches BGM in a battle, it remembers the position of the track at the moment of the switch, and after the battle is over, it processes the BGM back.
However, this does not work for single wav BGM.
This is because there is no position to switch back to.
There is a patch to fix this, which must be installed.
NAME.en=If Single MapBGM, always played from beginning.
INFO.en=In the case of SingleBGM using wav, when you revert from battle background music to map background music, you may revert to silent space.\r\nThis patch ensures that if you are playing SingleBGM, it will always play from the beginning.