As title says, using F3+N to go back to creative when joining a world as spectator doesn't work.
- Join a singleplayer world and go into spectator mode
- Save and quit to title
- Join the world again
- Press F3+N to switch gamemode; nothing happens
F3+N will only work again after manually going into creative again (via /gamemode creative)
- F3+F4 works as expected.
- The issue doesn't occur on servers.
- Restarting the game before joining again doesn't help.
- I haven't tested on other versions yet.