Reading any file causes coolreader to crash. If coolreader is set up to present simple file list (and thus does not read book covers from files), it will crash once a book is opened. If coolreader is set up to present a list of books with covers (and thus does read book covers from files in advance), it will crash when a book file comes into view.
This happens for coolreader 3.1.2-87, installed from F-droid. At the same time, older coolreader 3.0.55-32 from the same F-droid repository doesn't crash. (The repo claims that the list of architectures for 3.0.55 doe snot include arm64-v8a, so it must be working in some kind of compatibility mode - that might be the reason why it works, while the newer one does not).
I am getting this too, Version 3.1.2-68 works fine, but 3.1.2-72 and 3.1.2-87 in fdroid have the issue, I'm also on a Armv8-A
v3.1.2-102 on Samsung A3 2017 (SM-A320FL) Android 7.0
App also crashes but during book reading.