"Virtual Cycling" activities not synced from Garmin to Sporttracks (not visible in Tapiirik either)

[blitzkneisser]

I am using Garmin Connect, Zwift and Sporttracks. Zwift automatically syncs to Garmin Connect, Garmin Connect syncs to Sporttracks (both outside Tapiirik). Since that apparently only works for "native" activities recorded by my Garmin watch, I've set up Tapiirik to sync from Garmin to Sporttracks - to cover the virtual Zwift rides. That was working fine until around beginning od 2021.
Now the virtual rides are not synced anymore, they are even not shown in Tapiirik. All other activities are correctly shown in Tapiirik. Apparently the same thing happens when doing the synchronisation from Zwift to TrainingPeaks (automatically) and then from TP to Sporttracks via Tapiirik... is there an issue with the activity type?