AI Issue, "Waiting for Access"

Hey everyone, I edited the Centrella Sub a few months ago and added portals and schedules within the schedule library for various AI trains to spawn and follow. It has always worked great with little to no "babysitting" of the AI being required. The schedules have the trains using the "Navigate Via Trackmark" command following various trackmarks that I placed along the route for Westbound and Eastbound traffic respectively. However, after I updated Trainz 22 a few days ago, all of the AI trains now get stuck at junctions along the route with the message "waiting for access beyond/to...", even when they're correctly aligned and no other traffic is near. If I stop the trains, abandon their schedules, or even delete the trains entirely, the junctions are permanently locked and I cannot switch them. I've tried replacing the junctions just for the AI to lock those up as well. Any help on the issue would be appreciated.

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