By accident I found out, you can fall through the world in this corner of the entrance of the Minken Command Bunker. The corner I’m speaking of is marked by the crosshair in the picture below:
Yes , i also have encountered this bug , im on pc , and i can certainly say that it is very annoying when it happens and you dont have the safehouse unlocked , ( aslo you propably had the safehouse unlocked because you might enter a multiplayer seseion before the September update ).