I’d cut off an inch for good measure, recrown, and put it back into action.
This.
I had somewhat similar happen to a friend's Thompson with Wolf steel case. He jammed 2 more rounds behind the first, which split the barrel. I had the barrel removal tool and receiver vice bracket, so I pulled his split one for him and installed the new one. I kept the split one, which still had about 7 useful inches behind the start of the crack. I had a friend with a lathe shorten it to just behind the damage and then thread it to .578-28. I haven't yet crafted a shortened forend for my M1A1, but one of these days I'll do that, then pull the old worn barrel and mount that short sucker and put a fat can on it.