So I got a new MBP and turning it on today and it was unusable. The entire 1TB SSD was full and daisydisk reported over 800GB as "hidden space". I hard reboot seems to have fixed it but I still don't know WTF happened. I have mountainduck connected and thought it might have tried to sync all the external drives/servers I have mounted or something stupid but that didn't seem to be the case. Neither did anyone do anything stupid in any shared dropbox folders that auto-sync. I also have setapp installed but that didn't seem to be the culprit either. Is this some sort of known bug? Anyone any ideas?