Sorry guys, the way I coded v1.5 is very different from previous versions so unfortunately I can't just replace a piece of code and bring the emulator compatibility back. This implementation is cleaner, faster and easier to understand than the previous one, so it has come to stay.
That being said, I changed a lot of things around to make the hack more stable and my last builds have no issues with mGBA - I couldn't test Goomba Color though.
Toruzz, what emulator were you using when hacking the game, or which emulators are known to play the game well?
I use BGB for debugging and testing, and real hardware for the final tests.