Existing absences not fully updated following work schedule change

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Hello everyone

I'm hoping someone may have an insight into a strange issue we've encountered. When an employee's work schedule changes (in one example case from 7.4 hours Mon-Fri to 8.15 hours Mon-Thu and 4 on Fri), after the Evaluate Absences scheduled process has ran, any existing periods of annual leave are updated in line with the new work schedule, however, we're finding that day one is remaining as per the old schedule. So, sticking with the example, Tue-Thu of a leave entry updates to 8.15 per day, Fri updates to 4, but the Monday stays as 7.4 hours from the old work schedule. I have replicated this in our Test environment and the same happens each time - all periods of absence are update but with the Monday remaining incorrect. I have also double checked the Workday Pattern is set up correctly, which it is.