UICalendarView on Mac Catalyst - Command Key for Multiple Date Selection

A good while back, I created a Mac Catalyst version of an app. The app uses UICalendarView for both iOS and Mac. I have multiple date selection enabled. In the past, I thought I could select multiple dates on the Mac without needing to use the Command key modifier. And now I can't. Is this a change or am I dreaming? How can I go back to being able to select multiple dates without using the command key modifier?

UICalendarView on Mac Catalyst - Command Key for Multiple Date Selection
 
 
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