Qt Graphical Effects missing when running statically-built Qt Quick application with Qbs

When building the attached qtbug71551-qbs.zip with a statically-built Qt, all shader effects are missing. The symptoms are identical to those seen in QTBUG-67429, which was the issue that motivated me to start building statically on Linux in the first place. An identical project built using qmake with a statically-built Qt doesn't exhibit these issues.

In the screenshot above, there should be a drop shadow under the tool bar, but it's missing.

I've attached plugins.list and qml_plugin_import.cpp, which are files that Qbs generates that both show Qt Graphical Effects.