That is rather interesting
I guess this release never worked. In this case most likely very rare. Unless there may potentially be another one modified that doesn't contain the invalid m68k opcode.
@CrashDisk after removing the offending 'TREE' entry and replacing the memory region ($2C00 to $2F00) does it load in its entirety?
After reading the hexdump, it is still the Quartex release.
How would this particular one be marked in TOSEC, still as [b]. Technically the disk image has no errors / bad sectors.
Maybe:
Stunt Car Racer (1989)(MicroStyle)[cr QTX][h Freestyle][b Broken Release]?