Several players on our servers have reported the same problem. If you are merely passenger (not driver!) in a vehicle and fall unconscious inside, you are stuck like this. After some time you can see again, but you can't move. Relog then leads to character death and respawn on coast.
The logs show the player falling unconscious and regaining consciousness afterwards. However, player is still logged as unconscious and can't move.
2024-06-16 14:54:56.690 [DEBUG] 14:54:48 | Saving Player to API XXX Health: 44.4901 PlayTime: 71754.2 IsUnconscious: true IsRestrained: false 2024-06-16 14:54:04.115 14:53:54 | Player XXX regained consciousness 2024-06-16 14:53:38.112 14:53:36 | Player XXX is unconscious
Edit: 17.6.2024: Found steps to reproduce problem.