Hello,
I just noticed, at the quest step “Find Lorath in the windswept cabin”, you can usually destroy the bookshelf after talking to Prava. I got kicked while doing so. After getting back into the game the bookshelf is indestructible again. For curiositys sake I tried again with a different character: It is reproducible. If you log out when the bookshelf is destructible, but dont destroy it, it will be in place and indestructible when you log back in (barring you from ever seeing the room and the letter). Guess thats not intended.
Kind regards!