Hi, I've the same problem.
I've been thinking about it for several days and I'm comparing the module installed on Joomla 3.
The problem occurs on Joomla 4.
I noticed that in the form settings fields (unlike Joomla 3), in the "select filter fields" parameter I find the "data" field.
If instead I check in the "search results template parameters" area, in the "ordering options" field I find both "date" and "date publishing".
When I try to select a range of dates from the website, checking the joomla debug, whatever date I enter from the calendar, a value of zero is always passed in the from field, and today's date in to field date.