Extra usage being charged for Opus 4.6 1M on Max plan when session/weekly limits well <60%

I am on the max 5x plan. I have been using Claude Code in VS code since a while now. I often use the Opus 1M context window model. Since my usage all this while I never got an API error saying that extra usage must be enabled for Opus 1M. But just now I got an API error saying that extra usage must be enables using Opus 4.6 1M. (I was within my session limit, extra usage was already enabled but was set to 50$ and extra usage was around 46$ before the API error came in VS code). When I checked on Usage, more than 50$ extra page were used and my session limit is well below.
Why did this happen? My limit should have allowed me to use it! I was charged for my extra usage and now it is not even proceeding without increasing the extra usage budget even though I have session limits and weekly limits within usage limits (i.e., all well less than 60% at time of writing)