Alright, so basically, here's what happened with Fuego.
EDIT: I was able to update the map and as such the past/present tense of this bug report may be all over the place, as the missing difficulty has now been put back in its proper place
somehow but I'll try to be consistent here. Assume everything below up until the line is in past tense.
After the nominate button came about, me and Nao Tomori went over the map and did some minor cleanups.
Namely, while going over the difficulties, Nao pointed out that Jakomo's difficulty, at the time Titled {Jakomo's Advanced}, wasn't technically an advanced and made the mapset's difficulty spread look a bit weirdly-named.
I changed the difficulty name to Jakomo's Normal. No changes were made to any other difficulties at this time, other than Liiraye's difficulty, which was directly copied over from his update with Nao done previously.
Upon informing Nao that I had completed the update and things were good to go, he hit nominate. I did not personally go back to check and see whether the site had gotten the update properly, and I don't know if he did or not, but somehow Jakomo's difficulty had up and gotten messy in transit.
Specifically, the following:
1) The difficulty does not appear in the website.
2) However, the difficulty
is bundled with the .osz:
But appears as "Not submitted" ingame:
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For several days, I could not update the map, as I got a server-side error that I attributed to the map being "locked" from changes due to nomination. We kind of just shrugged and went "Shit's bugged, m8" and I worked on other stuff.
I just tried to update the map just now (8:30PST 3/4) to show the error message I got, but it actually went through and seems to have properly submitted the heretofore missing difficulty without changing the nomination status (Namely, that it was 1/2. And is still 1/2.)