Hi, i use BTT since 2 years and the start at login had no issues at all.
Now I'm using a new Mac Studio with macOS 12.3.1 and BTT 3.756.
I've tried and tried but BTT not start at login and I have to start it by hand every time.
If I add it to startup items using system preferences all seems ok but if I relog BTT disappears from startup items. Same BTT on an old iMac with macOS 10.15.7 works fine.