I linked to the discussion we’re having over the netlify plugin. The beta version for a while was not removing those, when someone had configured their site for ISR (which netlify doesn’t actually support, but the way it fell back was OK, prior to this brief time in the beta plugin). So, I suspect anyone who’s been running the beta plugin recently with ISR configured will have this same issue. It’s been fixed in the latest version I’m running, and without this cache purged, I’m going on day 5 of a broken website and no way to take payments from users.
Just checked, CDN is still serving this old page for anything that was accessed during this window (ie. /)