When this started showing up on Tuesday, and I noted in Technical support, I thought it was just cranky server restarting after downtime. But 3 days ago suggested members post in the Classic Bug reports forum.
Classic and Retail do have as far as I know, different development teams.
Unfortunately the GM staff I believe for the most part are in Texas, Developers in California. I’m sure there is a data base of known issues between the 2 departments. Thought I saw someone in this thread say it was being investigated?