perl-Mail-Box-IMAP4-3.007-12.fc39 fails to build in Fedora 39 because tests after upgrading perl-Mail-Message from 3.012-5.fc39 to 3.013-1.fc39 like this:

t/12client-flags.t .. ok
#   Failed test '...body'
#   at t/20server-fetch.t line 37.
#          got: '("TEXT" "PLAIN" ("charset" "us-ascii") "<unique>" NIL "8BIT" 10 2)
# '
#     expected: '("TEXT" "PLAIN" ("charset" "utf-8") "<unique>" NIL "8BIT" 10 2)
# '

A difference between passing and failing build root is at <https://koschei.fedoraproject.org/build/15737136>.