Custom widget missing movies when sorting by year

[AllesMeins]

Since recently I noticed that my "Oldest unwatched movie" widget is skipping movies. I've configured it to Addons -> Video Addons -> Emby for Kodi -> Synced Nodes (Static) -> Movies -> Unwatched and set sorting to "year" and "ascending". But this doesn't give me the oldest movies but seemingly random movies are missing. If I restart other movies are missing. I already tried pointing the widget to the local library or Synced Nodes (Dynamic) but had the same problem.

This happens only in the widget. If I navigate to movies -> unwatched and sort by year they are displayed correctly. For example: Currently the widget displays movies from the following years:

1997, 2003, 2003, 2005

While Unwatched movies contains three movies from 1992, two from 1993,...

I'm running Embuary 19.0.1, with Kodi 19.5 and Emby for Kodi Next Gen 7.13.7