Many applications in KDE using Qt cannot interact with files that contain some specific characters. The major projects (KDE) and developers are saying this is an upstream Qt problem and are saying it should be fixed here.

A filename can contain any 8-bit character except null and /, so it doesn't matter if there is some odd or unusual encoding in the way the filename can be interpreted. It shouldn't cause higher level applications to crash/break when a file/string has unusual characters, leading to stability and security problems.

https://bugs.kde.org/show_bug.cgi?id=377172
https://bugs.kde.org/show_bug.cgi?id=165044
https://marc.info/?l=kde-core-devel&m=122025063320264&w=2

The attached unicodegenerator.sh will create some example files that trigger this bug in KDE, Dolphin, and Konqueror.