When manually typing in either a date to the date time widgets in chrome (116.0.5845.188 or 117.0.5938.89 but this has been around in earlier versions too) the browser will reset and lose the value in the time widget. The opposite also happens in that, if you type in a time in the time widget, then your previously entered date will be reset and lost. e.g.

Typed in a date to the date widget:

Then typing in a time to the time widget and the date widget gets reset: and my previously entered date is lost:

This is a bit frustrating for power users who don't use the click helpers.

Doesn't seem to happen with firefox.