Remove inactive Techs from search

Hi, we are currently on and although I suspect is by design and has always been there, our users have reported when searching for tickets Inactive techs/people who have left the organisation are being displayed in the drop-down.
Is there a way to only show the active techs whether its a custom field that links in or something else?
Im 99% this has always been there as a legacy instance we have from 2020 has this behaviour too.

Many thanks!

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