Hostages and escorts cannot exit outdoor maps. This has always been the case, though before they used to just stand at the exit in most missions. Seems that the "follow you till the end of time" bug has spread to everywhere.
Thanks. I changed the Escort objectives to Release Captives, which basically performed the same function.
On the map Unique Maps -> Outdoor Maps -> City Map 01, I have four Escorts that are set to "Follow". But when I get to the exit, they won't leave, they just keep following me. Any idea why?