Comment # 5 on bug 1022687 from Fabian Vogt

(In reply to Bruno Friedmann from comment #4)
> Actually openSUSE Tumbleweed 20191230
> Linux 5.3.12-2-default x86_64 GNU/Linux, nvidia: 440.31
> Qt: 5.13.1, KDE Frameworks: 5.65.0, Plasma: 5.17.4, kmail2 5.13.0 (19.12.0)
> 
> We are still unable to handle correctly in gwenview, dolphin etc jpeg2000
> files even if TW contains newer jasper.

Support was explicitly dropped, see bug 1144249.