Sydney FP: Employees widget not showing any records when filtered by cat slug

I have a bunch of Employees setup, set their category to my own Author category, others as category Owner.
When I then use the Employees widget to display Authors and Owners in separate rows on separate pages, I get just empty pages. As soon as I remove the slug from the widgets config page, it lists all Employees as expected. As soon as I enter a category slug in the widgets field ‘Enter the slug for your category or leave empty to show all employees.’ nothing shows.
What am I missing?

Thanks

Hello @olafdraeger,

I have just tried to recreate your issue on my local Sydney Pro install, but it works for me. Can you please try to temporarily deactivate all your plugins except Sydney Toolbox and Page Builder by SiteOrigin, and see if it helps?

Kind Regards, Roman.