I provided all the details I can think of at the moment when this comment on the curseforge project page. More information will be added to this issue as I think of it as edits to this thread starter. I'll also transition that comment to a more organized form more fit for an issue tracker (again, as edits to this OP). I want to get this issue open ASAP and as such will forgo formality for the moment, though I'll hastily make edits to improve the post once it's opened

ffirst of all, as the topic line suggests, I'm unable to find prosperity ore, but not unable to find inferium. Furthermore, when I tried to place a block of prosperity ore, the server didn't accept the change and the block returned to my inventory instantaneously. I suspect that, for some reason that quite possibly involves the server architecture I'm using (forge mod loader + SpongeForge

wait, I'm an idiot, I figured out what was wrong. There is no bug or issue here, just me being stupid (frankly a rare occasion. Ask anyone that knows me). My character was in a form that does not allow placing blocks. Specifically, my character was a Vampirism vampire in "bat mode"
Please close this. I should never have opened it until I was certain I wasn't doing something wrong, but, well, things happen... sorry.