[DreadedGhoul575]

Like my above comment, it's the same on Death Toll Chapter 4, where they struggle to push through the zombies on the campaign, where they're basically taking small steps, until a another wave of zombies approach then die, repeat.
Might need to teleport them a bit closer to the saferoom after 2 minutes or so; on one of the balconies.

Could also be the same for Chapter 4 Dead Air and Blood harvest, but still testing with default bots at the moment.