[Invalid] Android: Sharing to primary Library?

Many Android app, e.g QuickPic and Es Explorer, allow to share files with Seafile. If I choose share, I am asked by Seafile for the target library. The list contains all of my libraries except for the primary library.

I can see the primary library, if I open Seafile normally. The name of the primary library contains only ASCII letter (“MartinsBibliothek”).

Is this a bug or do I miss something?

Android 7.0, Seafile Client 2.2.1

Whatever went wrong an hour ago, now I can see the primary library again.