Date picker shows `undefined NaN` when user manually enter date into a date field

[shbchk]

EE 7.2.8

I got several date fields on a page, so, sometimes it is much easier to copypaste the selected date from the first field and manually correct them later, without using a date picker.

But when I do this, the date picker shows NaN:

Here is the video for a better understanding of the issue:
video-convert-1675324248798.webm