DateTimePicker question

Hi, I have a DateTimePicker like this:
Forms\Components\DateTimePicker::make('start_time')
   ->format('Y-m-d H:i:s.v')
   ->step('.001'),

Model cast
'start_time'   => 'datetime:Y-m-d H:i:s.v',

When I generate a new record, it is saved correctly and in the table, but when I open the form to edit by milliseconds it is not seen.
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