QML Engine does not run AOT code or bytecode created by qmlcachegen

The QML engine will not run AOT compiled code or bytecode generated by qmlcachegen.

My steps:

1. compile the attached test
2. edit <builddir>/.rcc/qmlcache/cachegen_test_qmlcache_loader.cpp
   1. add 'qCritical() << ":: REGISTRY INIT";' on the first line of "Registry"'s constructor.
   2. Add 'qCritical() << ":: lookupCachedUnit" << url;' on the opening line of 'Registry::lookupCachedUnit'
3. edit <builddir>/.rcc/qmlcache/cachegen_test_test_qml.cpp
   1. Add 'qCritical() << ":: AOT EXPRESSION EVALUATED";' following the comment that starts with '// expression for onCompleted'
4. recompile the test, ensuring the edited files are rebuilt

You will see the following:

> ./build/cachegen_test
:: REGISTRY INIT
qml: Component.onComplete called

The only thing happening with the generated cache is initialization of its registry. It is never used to load a compilation unit, and the AOT compilation does not run.

Logs with QML_IMPORT_TRACE=1 and QT_LOGGING_RULES="qt*=true" are attached.