Full game can be played with non-premium account

I have a test account for demo mode.
https://minecraft.net/haspaid.jsp?user=Motohiko_nonpre
(This account is not migrated to Mojang account.)

When I tried to launch demo mode with new launcher ver.1.0.1,
Minecraft runs in normal game mode.

I attached a screenshot. The button 'Play' should be 'Play Demo'.