TextInput datetime with milliseconds

I may be missing something.
I have the following TextInput:

TextInput::make('finish_time')
   ->type('datetime-local')
   ->step('.001'),


Model:
protected $casts
    = [
        'start_time'   => 'datetime:Y-m-d H:i:s.v',
    ];


For example, if I want to change only the milliseconds, it is not updated in the database, but if I also change, for example, the seconds, the milliseconds update correctly
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