Is there a tricky bug in the implementation of the profiles in the Joplin Android app?

Test with B-User first
2023-10-24 – 19:28 – Joplin App uninstalled from Anfroid test device
2023-10-24 – 19:29 – Android App installed from Play Store
2023-10-24 – 19:32 – Profile name changed from Default to B-User
2023-10-24 – 19:33 – Default Notebook „Wilkommen!“ deleted
2023-10-24 – 19:35 – Synchronisationsziel set to „WebDAV“
WebDAV-URL, User name and Password from B-User copied copied from Passwordsafe
2023-10-24 – 19:35 – connectivity test and first synchronization successful
2023-10-24 – 19:37 – New profile A-User created and App restarted
2023-10-24 – 19:38 – Default Notebook „Wilkommen!“ deleted
2023-10-24 – 19:56 – Synchronisationsziel set to „WebDAV“
WebDAV-URL, User name and Password from A-User copied copied from Passwordsafe
2023-10-24 – 19:40 – connectivity test and first synchronization ERROR
2023-10-24 – 19:41 – Screenshot 3rd error message
2023-10-24 – 19:44 – Profile A-User saved
2023-10-24 – 19:53 – try sync again and get 4th error message
2023-10-24 – 19:58 – long screenshot from Log after 4th error message