After S7 lunch STF's don't give dilithium and optional mission reward loot. Because this change wasn't mention in patch notes I assume it's a bug which should be repaired a.s.a.p.
Other way dear Cryptic you will show how low you value your players and customers.
Sorry for any mistakes, english isn't my primary language.
"Dear players we have for you new useless event and only-one-map-use-divices, and much more new "content", but we can't repair glitch in chat system which make mutes on private channels permament. So deal with it and give us your remaining money."