Yes... "Bump" indeed! lol
This problem emerged quite early, and your right, there have been so many posts about it, but NONE of them are getting any attention. i fear that this will just become an accepted flaw... but boy how I hope this is not the case!
On the plus side, this glitch does seem to be limited to the continuation of existing game modes, ie, for me NG+, but with others its happening after coop...
Nonetheless, if you started a new game on hardcore, pure survival or oldschool mode, this should reset your bots to the normal story progression.
This is far from a solution as i plan to keep going with my NG+ until i get 100% completion, so i still need to endure about another 1.5 playthroughs like this before i start all the other more challanging game modes.
Please give us a fix soon Visceral and or EA...