Was this resolved in the final 18.2..? I'm chasing a strange intermittent issue of today's workout not syncing to the Watch thus not sure is due to this.

Using .inline would still work fine when UIDatePicker is set as as UITextField.inputView but major issue that for some reason UIKit hard-limits the keyboard height to some (seems like) calculated value. Say in iPhone 12 mini it's 357.6666pt. Because UI is laid out to use full width, this pushes picker's header view to something like 6pt and thus render it unusable, since you can't easily tap to change the month/year.