I tryed using brackets in objectives the objectives worked and everything but if i try to use them as an argument in command blocks they screw up the whole command example: testfor searches for the player with the name "@a[score_(test)_min=1]" instead of searching for any player with the score of "(test)">=1 other things i reported that are caused by the same bug
( thought they were different after further testing i managed to figure this out)

other bugs i reported are:

MC-32420
MC-32422
MC-32447

you can look at them aswell for more information