I've recently updated a Joomla 3 site to Joomla 4.  One of the many changes I notice is that when I have an article with a displayed created date below the title, it has an empty tooltip on hover.  The html code shows data-uk-tooltip="".  
This is clearly a uikit tooltip.  When I test and disable uikit on the template styles page, the tooltip code is there, but the tooltip doesn't trigger on hover.
What is adding the "data-uk-tooltip" code to the date, and how can I get rid of it?
Thanks.