Hi @CptAshie thanks for the information provided.
I'm sorry to hear that the issue still occurs on the current update and that reloading an earlier save does not work. I'm afraid it would appear that your save file is corrupted after the game crashed.
You mentioned that after desyncing several times you are teleported away from the area but when you return to the area it says area not available. When you return are you able to see Sigrun and Halstein or is there no sign of them? When you return to the area and it says area not available do you desync again? If ...