@Always
The former employee who quit, then loses new job and files for unemployment….
You extend an offer of reemployment. His/her return would not be under duress. You were not unsatisfied with performance. You offer same level position as previous with same benefits. the return is not under duress.
You are not chaining the former employee as a slave. Free to leave at any time, but not to cause you an increase in your unemployment tax rate, when not fired or laid off.
BTW…back 40 years ago I was the Director of Personnel for a multi state manufacturing company (CT, NY, PA and SC). I protested many an unemployment claim that I considered unjust, unfair, etc. I attended the hearings. Most employers don’t show and the ex employee collects by default. I never lost a case.