I noticed, when using the Accessibility Insights tool, that the Date Range Picker component has an invalid value of "null" on the aria-activedescendant attribute on the input. It even happens on the demo page of the component:
Even if using the DateRangePickerPresets, changing to one of the available options doesn't update that attribute. When changing option, the aria-activedescendant should update to the id of the element that was focused on in the pop-up (see attribute definition:
aria-activedescendant - Accessibility | MDN (mozilla.org) ).
Slightly related, we can't seem to be able to set the ID of the DateRangePickerPreset elements, which makes it difficult to pre-select one, unless we use the Start and End parameter values to infer which element is selected.