My world's multiplayer automatically turns off when I start my world. I can't send invite to my friends. Even I asked my friends to turn me favourite, even then, they could not see my name tag in joinable friend. So I can't play with friends and multiplayer. I can see invite game only when I am in featured server or server added by me with server name, server address and port. First three screenshot are of minecraft before opening the world and last two are after opening and pausing the world.