Last year I had an issue with Morrowind where I couldn't go to Vvardenfell when I couldn't log into the game via Steam. Are such issues possible with Summerset, or has there been work done to prevent this?

Specifically I'm speaking of the issue described in this thread: https://forums.elderscrollsonline.com/en/discussion/351293/the-morrowind-chapter-is-not-enabled-on-your-account-even-though-i-bought-it