Sega Saturn tech bulletin #51 states:

The following instructions codes cannot be used in programs for the 68000 Sound CPU installed in the Sega Saturn:
RESET instruction
TAS instruction

I suspect the problem is the same as on Gargoyles since the Genesis 3 also uses a Yamaha-built integrated 68k.

Of course it could be anything else. If anyone wants to build a test cd that checks this, I can run it on such a machine.