Bug: Articles in "All" tab always appear to be read after synchronisation

[vocux]

The synchronisation (or rather the display?) of the read state of articles seems broken to me:
When articles get synchronized and I click on any feed in the "All" tab, it shows me that all my articles are already read (which of course they aren't). Then, when I then click on any feed in the "Unread" tab, it correctly shows me all unread articles, and only after I've been there it shows me the correct unread status in the "All" tab.

Directly after synchronisation:

After I've been in the Unread Tab

I've tried other RSS apps and they all seem to synchronize fine, so it can't be a problem with FreshRSS or the API.