All QML plugins have a RUNPATH that points to $ORIGIN/<parentdirs>/lib64 , but Qt libraries are installed to "lib" without 64.

For example "qml/QtQuick/Controls/Basic/impl/libqtquickcontrols2basicstyleimplplugin.so" in qtdeclarative has a RUNPATH of
"$ORIGIN/../../../../../lib64:/home/qt/work/install/lib". It should be "$ORIGIN/../../../../../lib:/home/qt/work/install/lib". (As was the case until recently.)

The same is the case for all other QML plugins that I checked in other Qt modules (e.g. qt5compat, qtmultimedia). "Normal" Qt plugins don't seem to be affected, e.g. the qmltooling plugins still have "lib".