Yeah that is weird, i've heard that noise before but it's weird that the event happened with no real signifier. most of the time you'll at least hear a noise or something but you just happened to try to pause. this update was pushed out kind of quickly though according to the dev so glitches are expected. all i can really think is maybe sending kerfur out to do something and checking the basement. Are you running mods?
Viewing post in Voices of the Void 0.8.1 Bug Reports
It's a common bug that people have been running into with this new version (some kind of event that triggers the meta-paranoia and just doesn't end). One way I've found to force a save is to clip into the backrooms. I crawl under the base (using that floor triangle with no collision by the front door to the left of the mailbox) and shoving myself into a corner and ragdolling until I clip somewhere and it sends me to the backrooms. I have stuff in the mailbox, so whenever the game saves it makes an alert noise, and I can hear it right before I'm transported. It's been working so far.