Dependent age out fast formula not working

We have a requirement where if employee is enrolled in Medical Plan - Employee + Family option and if employee has more than 2 or more children and 1 spouse and 1 child loses eligibility, employee should remain in same (Employee + Family) option

We have a requirement where if employee is enrolled in Medical Plan - Employee + Family option and if employee has 1 child and 1 spouse and child loses eligibility, move employee to 'Employee + Spouse' option

But it is not working. When I am evaluating the life event then it is not defaulting to any medical plan and option. I checked the logs there it is returning Y.