https://bugzilla.redhat.com/show_bug.cgi?id=1258940
--- Comment #1 from Ralf Corsepius rc040203@freenet.de --- I can reproduce this issue and believe to have identified the commit to blame.
Reverting the commit below lets perl-Log-Dispatch-Config's testsuite succeed, again: https://github.com/houseabsolute/Log-Dispatch/commit/b92533ceaf813a2b237ab8e...
I haven't tried to furtherly investigate, but I am inclined to believe this change in Log::Display may expose utf8 issues with the packages listed above.