It does look like your build worked. I saw the shared object at /usr/lib/x86_64-linux-gnu/qt5/plugins/platformthemes/libqgtk3.so. Perhaps you need to force using it by running keepassxc with environment variable QT_QPA_PLATFORMTHEME=gtk3? You can see info on QT plugin loading by setting QT_DEBUG_PLUGINS=1. Also, to rule out permission issues, you may want to try installing the snap in devmode.
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