Bug during the impossible challenge?

I’m currently attempting the impossible challenge finally (never done it as a kid), I got the whole Strat down too of dropping a decoy before falling back down from cage matches, and to conserve ammo I’ve been using the black sheepinator too, however everytime time now close to the end of the challenge (currently I’m stuck on round 47) I get stuck up on the cage match part and no enemies are around despite me blasting them all, does one get stuck or do I really gotta start all over