On the https://testresults.qt.io/coin/integration/qt/qtdeclarative/tasks/web_qt_qtdeclarative_1726229114825 
A lot of undefined references are encountered during test building.

It seems that some references on link line should be repeated but are not.

After chat with alexandru.croitor I did verify on a VM that following will fix the issue.

Manually copy and run the failing test link line, but modify it to mention '/home/qt/work/install/target/lib/libQt6Qml.a' one more time after the last '/home/qt/work/install/target/lib/libQt6Quick.a' occurrence.