Even if you forget to save, if it is just before you have the chance to get back the data.
If you have started the emulator from FEBuilderGBA, a file named ROMNAME.emulator.gba is created.
If sappy was started from FEBuilderGBA, a file named ROMNAME.sappy.gba is created.
These are created in the same directory as ROM.
These will be updated each time you start the emulator or sappy.
Therefore, if these files can be collected, it may be possible to recover the lost fixes.
Next time, if you forget to save, check these files.