I think I know what's going on here,
Wikipedia as example you type
wiki it won't auto complete
but if you type
en.wiki it will autocomplete
so it will only autocomplete if you type using the actual first characters of the URL not characters that makeup the url.
Also I see now why Safari has the smartest URL autocomplete and all other browsers have comparatively
dumb autocomplete. It's because Safari uses Siri for suggestions, and also page titles and it almost always suggests the site and domain completion, even if it's not in history and bookmarks, no other browser does this. Kinda strange though because auto suggest in iMessages on iOS/macOS is so fscking dumb it's embarrassing, having a conversation, lets say about lunch, the word is typed several times in the conversation yet its too fsckin dumb to suggest the same word again, does it for many words...but that't Apple not Orion..oops.