Manually evaluating open enrollment life event is overriding the previous rate for plans.

Summary:

The Vision Plan rate was originally set to 7.3 effective 1/1/1951 and later updated to 10 effective 5/1/2026. However, when manually evaluating open enrollment as of 4/1/2026, the system is incorrectly applying the updated rate of 10 to prior effective dates as well, impacting rates for previous life events.

How can we ensure that the updated rate is applied only to new enrollments from its effective date onward, without overriding rates for past enrollments?