@MojangSupport I have owned Minecraft since 2014. I open Minecraft and out of the blue it tells me I can only play the demo world. I am logged in, I have used it on this PC before. I have no idea what is happening. Lunar client works, everything else works.
If you can only play Minecraft demo, please visit https://help.minecraft.net/hc/en-us/articles/360029643892-Can-only-play-Minecraft-demo-Java-Edition- … for help.