Is this cracking foundation under a jack post a problem that requires repair?
I'm not familiar with USA house construction methods (I live in the UK) but speaking as a mechanical engineer, I wouldn't even stand near that thing while debating how safe it was.

That bolt is presumably supposed to be fixing the post against it popping out sideways. I suppose it was meant to be bolted to a metal beam underneath the concrete. So either that whole beam has sunk, or all the rest of the concrete floor has heaved up for some reason (ground water underneath. maybe?) or there isn't any beam there at all, and it's just an undersized-looking bolt sticking into a bit of broken concrete.

It looks to me like it's just waiting for the right moment to make a nice loud PING as the post flips out sideways and the whole floor above it collapses.......

One more thing. That metal post didn't get longer by magic. So if it has pushed a hole in the floor, whatever is on top of it must have settled. That could mean the whole house is sinking unevenly for some reason.