It’s not a bug. You’ve been shadow nurfed to free tier
Also, it seems that something is happening on the billing / api side. My guess this is preparation for a new Antigravity release, and I dare to assume that it will have a different approach to billing and quotas. Most likely, it will be announced at Google i/o 2026 on May 19-20. So all we can do now is wait. They don’t care about users; they only care about marketing and impressing stakeholders