Got a couple of websites hit on 21th,
They were doing pretty well in terms of ranking/impressions/clicks,
Both have some decent link profile, solid/better overall UX signals compared to the rest of the competitors,
Something strange is occurring,
Both do rank for some keywords 5% of the time, in the top #3, totally out of SERPs for the rest,
I would give it some time, it got automatically resolved/reversed after a couple of weeks for several cases