Track sync between Garmin Connect and Fenix 5 fails

Hi all,

I created tracks using the Connect app or Website and sent them to the watch. Notifications state the completion of the sync process but nothing is visible on the watch. Both Android app using Bluetooth or Homepage doesn't work.
The watch is on v7.10. Reboot doesn't help.

Does anyone has experienced the same issue or does know a solution?
Thanks for help.

Regards,
Marc