Autocomplete rule is not evaluated when probation period is changed

We have created two autocomplete rule to change the probation end date basis the assignment DFF and probation duration, please find below document for configurations.

Requirement - Probation Start Date = Assignment DFF (Date) + Probation Period

Rule 1- Probation Start Date (field modification)
Rule 2- Probation Period (field modification)

Partial Trigger added on Probation End Date -

dffFlx_BaseWorkerAsgDFFIteratorprobationStartDate__FLEX_EMPTY prpInp pbuSel pphLbl

The configured rule is working when we enter probation period first and then the probation start date (assignment dff).

However, same is not working when we enter probation start date (assignment dff) first and then the probation period. Here, probation end date is getting calculated as Hire Date + Probation Period instead of Assignment DFF (Date) + Probation Period).