it looks like exception, not like rule
what about not having such exception?
alternative 1:
you never allowed to create group with 0 liberties
to capture white group, black needs 1 more liberty
black can’t play here
black can play here
alternative 2:
its always allowed to create group with 0 liberties, but all groups with 0 liberties disappear simultaneously before next move
black can play here
moment later:
it also solving hypothetical problem: “what if there are already multiple 0 liberty groups on the board?”
just remove all of them
any possible position is not against rules with such variant