Interference autocomplete rules

Dear all

We have an autocomplete rules which interferes in a quick action where it should not interfere.

In short; The manager uses the quick action 'Manager change' for a few of his contingent workers. On some contingent workers, it works, for others, there is below error message. It's also only happening for 1 manager and the rule is not new (there since 6 months). So really weird situation...

Quick Action: Manager Change

Rule applies for Terminations - Please see attached both the screenshot and set up of the rule details.

Many thanks for any help!