Language copy issue only for language code "cs" and "cs_cz"

Hi All,

Currently we have an issue whenever we trying to create the language copy for Czech with language code "cs" and "cs_cz",It displays the blank page after language copy has been created, in the preview mode as well as via the domain URL, The issue is only for pages which are created using language code with "cs" and "cs_cz", it is working as expected whenever  we use some other standard language code for language copy.

Thanks in advance,

Girish