when i loaded the save file again today, it somehow got solved and now works fine. What happened is that, once i got the core, the way out of the basement wasn't unlocked for some reason, i couldn't get out even *without* the shackles equipped. Guess closing and opening the game again solved the issue and i could finish the content. Maybe it was a my-pc thing? Idk. Anyways, this was a really nice update! Loved the content