Turns out it works in editor but when running it outside of it it opens menu in a loop when going back to it. I then tried setting it up differently, everything works fine in editor. But when running it outside editor in game menu opens but apart of that does nothing. I can see how buttons get visually clicked but anything it fires is ignored, even print on screen doesn’t show up.
It appears there are several things broken concerning menus. Is there any menu setup that works in 4.8 and higher and works when run outside of editor and works for multiplayer games? Are there any such example I could look at?