Unintended Behavior on some date picker fields

Description

• go to a date picker field where the date is preset (see below "Occurrence")
• remove the date of
• click the calendar icon of the field
• click apply in the date picker dialog
• Expected:
  • The selected date (with time set to 12:00) will be selected
• Actual:
  • Nothing happens field

Occurrence

• Configuration /platforms-and-devices field Configuration at date
• Configuration /platforms-and-devices/mount field Select begin date

Additional information

• These fields have preset dates
• Configuration at date field is bind to the store variable selectedDate
  • the setter of this variable won't get triggered when the value is null
• Select begin date does not update (emit it's update) when the value is null