Completed rides not registered by Zwift Companion App

Hi, just completed my last 3 rides from the “Build me up” training plan and getting some weird behaviour from the Zwift Companion App. Sometimes it just marks the ride as expired in the companion app, sometimes it just deletes it from the training plan (and this morning a “disappeared” ride has come back, now marked as expired. I do explicitly save them after completion and give time for that to happen, as demonstrated by all these rides appearing on my Strava app. Any help appreciated!