Date search error when setting locale Korean

When setting [Setting]-[Locale] in Korean on the Admin page
An error occurs in the date search function on the Admin page.

If you look at the picture below, a red line appears, and a red line appears even if you enter the date.
So I can’t search.

Please check.

why do you have .6.6 at the end of the date ?

I don’t know. This is a phenomenon that occurs automatically when set to Korea.

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