I'm not talking about the Colony World provisions, but the regular Fleet Holdings provisions (Spire, K-13, Embassy, etc.)
Why doesn't donation of these reward Fleet Credits?
I understand you can buy them easily from the Replicator (with Fleet Credits), but there are some which can be 'earned' - like the Dilithium Mine and K-13 Provisions as well as those from Lockboxes.
Donating these resources should reward Fleet Credits regardless if purchased or earned. And yes, it seems silly that something bought with Fleet Credits would reward Fleet Credits. But that is how Fleet bought Duty Officers that are donated to projects work.
It's really frustrating to accumulate these resources by spending time doing the missions in-game only to have them essentially worthless to turn in.