In AMC mode, when viewing a user page that does not have history, the page actions toolbar is missing all actions aside from History (ironically). However if you go to Talk > Read as Wiki page, the actions appear.
|user page||user talk|
There seems to be no issues with user pages with history
Possibly of note: when viewing the same user page (the one without history) with AMC off, there is no toolbar at all. This seems to be true generally of not-yet-created user pages (see https://en.m.wikipedia.org/wiki/User:SpicyFlowers), though in this case I'm fairly certain the user page does exist.
Browser & device: all devices & browsers