I have yet journeyed back to Svetloyarsk myself to test the scenario, but here is a step by step process of what I did to produce this issue initially:
1. Enter the Svetloyarsk police station. (or whatever the building actually is)
2. Open the jail cell (1st floor, immediately to the right)
3. *Completely* enter the jail cell
4. Face the doorway and attempt to exit the jail cell