If a player logs out in MBVMC and logs in whilst there is a toxic / contaminated event running at that location the character gets moved inside a nearby rock, unable to vault or glitch out from, only option is suicide or ask a friend to come and kill you.
I have replaced the following co-ords inside cfgEffectArea.json
From:
[4420, 8117],
To:
[4127, 8147],