WebDAV and special characters

I am using Joplin 1.0.197 (prod, darwin) on MacOS to sync via WebDAV to a Synology NAS. If the user name contains accented characters, Joplin cannot login to the server. Without the special characters, the sync works perfectly. I can sync via WebDAV with this user name using other apps, so this problem seems to be specific to Joplin. Is this a known bug, and are there solutions?

Yes, this is a problem with the WebDAV component. AFAIK there is no solution.