Thanks for reporting this. This is likely related to a reported issue tracker[1] regarding App Engine Flex where the cause is likely due to connection issues or some other change interrupts the run of gcloud which causes the previous versions will be left in their existing state. As a workaround, you can split traffic to the new version to migrate traffic as detailed by the below gcloud command[2] or though the Cloud Console (please note that the information in the document[2] is incorrect, you will need to use traffic splitting for App Engine Flex in the Console[3]).
[1] https://issuetracker.google.com/63711899 [2] https://cloud.google.com/appengine/docs/flexible/java/migrating-traffic [3] https://cloud.google.com/appengine/docs/flexible/python/splitting-traffic#splitting_traffic_across_multiple_versions -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/cafbb9b6-f3ba-4eb1-9137-6402b30741f1%40googlegroups.com.
