Is there a bug in today's update where the cache can't be cleared for elements?

Suddenly today I can’t make any change in style.css, I even deleted it, purged the server cache, cleared cloudflare, used a new browser…old element styles can’t be changed in Cornerstone, Developer tools continues to show the old style.css version from the chlid theme which I even deleted, I tried switching to the X Pro parent theme, still hanging onto element styles and ignoring Cornerstore, So I’m wondering if it could be the update?