[2020] tiger thresher nest

Hi! Sorry for the trouble. We're pretty sure the problem isn't actually the threshers or that mission, but that there is currently an issue with certain weapons: hitscan weapons (= firearms that hit the target immediately as opposed to launching a physical projectile at the target) sometimes don't work in specific areas around the sub. There was a similar report in our public issue tracker about this recently ( https://github.com/Regalis11/Barotrauma/issues/4291 ), and we believe we've got a fix ready now. If possible, we'll see about including this in the upcoming hotfix, or at latest, the problem should be fixed in the next proper update (that one being somewhat further away in the future)!