Most of them come from my day job, so I'd rather not share those in a public forum. Or, they're so convoluted that it would take me hours to explain in typing, in part because some of them I'm still not sure how they happened. Or, the drama is still going on. (I just tried to type out one example, and I'm giving up. I really don't have the time today. I might try again later, if I can figure out how to explain some of the more baffling aspects.)
I can think of one that is fairly short and simple to explain, though. A very young coworker (fresh out of high school) who worked with us for about two months was constantly making references to memes and shows that most us had never seen. Without the context, they fell rather flat, and he'd often have to explain, but we'd still not 'get it'. Like jumping to the punchline of a joke without the leadup. Very minor, but a perfect example of assumptions that the listener knows what you're talking about.
One that is more related to Fiverr, as an example of 'need more info', is this thread I participated in two years ago, back when Buyer's Requests were still a thing (forewarned: it's a fairly long read).
https://community.fiverr.com/forums/topic/276507-new-to-fiverr-and-looking-for-digital-artist-for-large-project/
Also, I just watched this yesterday, and the first 1:45 of the video is a perfect example of cultural assumptions and miscommunication:
People are confusing. Communication takes work. And communication skills need training, just like any other skill.