Autocomplete rule in Classic UI

Dear all

We have an autocomplete rule to limit the termination to 'Contractors' and 'Employees' in some cases.

The rule is configured that it needs to show an error message if person type not in Contractor, Employee. However, when performing this action in the classic UI, the error message is always triggered, even when it's a contractor or employee.

Does anyone have any idea on how to solve this?

Many thanks in advance!

Kind regards

Annelies