The problem is that KDE 5.14 platform has i386 discontinued (5.12 is fine). So, you have to build it yourself by changing https://invent.kde.org/kde/plasma-an...elfish.json#L4 to 5.12. Same goes for Maliit plugin - cannot build it against discontinued platform/arch combo. Shift to 5.14 came as Plasma is moving to 5.14 by default. Building is not difficult, you have to install platforms+SDK with correct arch on your PC and then use flatpak-builder.