Can't find blood echoes after dying and signing off

I stumbled across this reddit post and it turns out multiple players have also experienced this. Turns out there is a way to retrieve your blood echoes. Go to the Lecture Building and, for some unexplained reason, your blood echoes will be in the room adjacent to the bonfire. I really hope this helps someone out in the future. Happy hunting!

Update:

I did a little experiment where I intentionally died, exited the game and continued. I can confirm that regardless of where you died, you can always go back to the Lecture Building (1st Floor) and find your blood echoes waiting for you.