Issue with Object Validation in Convert Pending Worker. Error does not clear

Summary:

We have a Object Validation rule based on 2 values from Assignment DFF Benefits Eligibility , if the Value is "Eligible" or "Eligible - Exception" the Assignement DFF for Benefits Service Date field cannot be null.

ACR Rule seems to work fine on our testing for Hire and Rehire but for Convert Pending Worker, the error does not clear after updating the Benefits Service Date

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22D