Alright - well... After spending way too many hours on this issue, tracing through all of the Perl changelogs and what they've done, and then going through all of our Perl C++ API integrations to find out where the issue lies, I finally found it >_<
https://github.com/EQEmu/Server/comm...c41755ce29b0a2
Debian 9 should be good to go and any other Linux releases that up to the same version
Enjoy!