“If your DB ends after 2200 on your second-to-last day, more than likely CS will leave you as LC following rest, which ends after the 1000 auto-release.

It’s not a foolproof technique”

It is though actually. Your last day of SC the latest you can be assigned a RAP is 1000, so you have to be converted to LC and you’re already auto released since you don’t start LC prior to 1000.