[cravenge]

Yes, I have experienced this issue too and on some servers, either vanilla or modded.

If I have to guess, this is a problem when numerous orders are given to the bots. There are times that the bots will still shoot common infected, despite a human survivor throwing a pipebomb. But this one ruins everything.

I think the processing of the orders to shoot common infected might have overflown or halted midway. It doesn't happen to the orders to shoot special infected, though. And, yes, the only solution (that I can think as of now) is restarting the game/server.