Cannot play offline

Unable to login to the launcher without internet connection, despite a successful login while connected.

What I expected to happen:
After a successful login while connected to the internet, I expect opening the launcher without internet to show Play Offline as opposed to Play.

What actually happened:
Despite a successful login, opening the launcher without internet connection shows the login screen. "You are already signed in as <username>." Clicking on the button next to that does not proceed to the News Update screen-- instead, it forces me to login.

Steps to reproduce:
1. Run the launcher with internet connection. Ensure all login credentials are correct and click Play
2. Close and reopen the launcher without internet connection
3. Click on Play on the username login screen