Something similar happening to me here, did the stage 3 race yesterday. No badge nor rank.
Activity shows in Companion and feed and Strava.
Strava: https://strava.app.link/Wakt5j3Vv6 …
I even got the Zwift mail “thank you for completing Stage 3”.
Anyway not badge/completion tick and no rank.
I have an iPad and during this race I had some connectivity issues, but I assume if it was not a valid race, it wouldn’t show everywhere as completed…
I could save it without problems tough, with no crashes…
Sent a support mail, lets see…