While selecting the "start screen" feature and turning the screen rotation into landscape, suddenly the feature is broken and returns to the main page of the app.

Expected behavior

When I select the "Start screen" feature and change screen rotation to landscape, this feature should not be damaged.

Actual behavior

When the user selects the "Start screen" feature and turns the screen rotation into landscape suddenly this feature is broken and returns to application main page.

How to reproduce

• Download the application on f-droid.
• Run the app.
• go to settings and select "Start screen" feature.
• Turn screen rotation into landscape and suddenly this feature is broken and return to the main page.
• Browser: web version opac 5.3.1System
• operation: xiomi redmi 4A Android version of Android: 6.0.1

Recording of the Bug