Howdy
It looks to me like the enums have just taken place of the bits. An EnumSet actually is functionally equivalent to the way the mutex were used before.
eg if previously MOVE was bit 0 (=1), JUMP was bit 1(=2), LOOK was bit 2(=4), and TARGET was bit 3(=8)
then a mutex of 7 = 1 + 2 + 4 = MOVE + JUMP + LOOK
is the same as an enumset of {MOVE, JUMP, LOOK}
You just need to find the 1.12.2 mutex bits which correspond to the new flags.
Goal.setMutexFlags() appears to be the method you need.
-TGG