cmake: module "QtQuick" plugin "qtquick2plugin" not found

agent:2020/11/05 10:13:25 build.go:379: test 1
agent:2020/11/05 10:13:25 build.go:379:     Start 1: tst_examples
agent:2020/11/05 10:13:25 build.go:379: 1: Test command: /home/qt/work/qt/qtdoc_standalone_tests/tests/auto/quick/examples/tst_examples "-o" "tst_examples.xml,xml" "-o" "-,txt"
agent:2020/11/05 10:13:25 build.go:379: 1: Environment variables: 
agent:2020/11/05 10:13:25 build.go:379: 1:  PATH=/home/qt/work/qt/qtdoc_standalone_tests/tests/auto/quick/examples:/home/qt/work/qt/qtdoc_standalone_tests/fake_prefix/bin:/home/qt/work/install/bin:/opt/cmake-3.18.3/bin:/usr/local/sccache:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/opt/squish/squish_for_qt/bin
agent:2020/11/05 10:13:25 build.go:379: 1:  QT_TEST_RUNNING_IN_CTEST=1
agent:2020/11/05 10:13:25 build.go:379: 1:  QT_PLUGIN_PATH=/home/qt/work/qt/qtdoc_standalone_tests/fake_prefix/./plugins:/home/qt/work/install/./plugins:/home/qt/work/qt/qtdoc_standalone_tests/./plugins
agent:2020/11/05 10:13:25 build.go:379: 1: Test timeout computed to be: 1500
agent:2020/11/05 10:13:26 build.go:379: 1: ********* Start testing of tst_examples *********
agent:2020/11/05 10:13:26 build.go:379: 1: Config: Using QtTest library 6.0.0, Qt 6.0.0 (x86_64-little_endian-lp64 shared (dynamic) debug build; by GCC 9.3.0), ubuntu 20.04
agent:2020/11/05 10:13:26 build.go:379: 1: PASS   : tst_examples::initTestCase()
agent:2020/11/05 10:13:26 build.go:379: 1: QWARN  : tst_examples::sgexamples(/home/qt/work/qt/qtdoc/examples/demos/samegame/content/levels/level0.qml) QList(file:///home/qt/work/qt/qtdoc/examples/demos/samegame/content/levels/level0.qml:51:1: module "QtQuick" plugin "qtquick2plugin" not found
agent:2020/11/05 10:13:26 build.go:379: 1:     import QtQuick 2.0
agent:2020/11/05 10:13:26 build.go:379: 1:     ^)
agent:2020/11/05 10:13:26 build.go:379: 1: FAIL!  : tst_examples::sgexamples(/home/qt/work/qt/qtdoc/examples/demos/samegame/content/levels/level0.qml) Compared values are not the same
agent:2020/11/05 10:13:26 build.go:379: 1:    Actual   (component.status())  : Error
agent:2020/11/05 10:13:26 build.go:379: 1:    Expected (QQmlComponent::Ready): Ready
agent:2020/11/05 10:13:26 build.go:379: 1:    Loc: [/home/qt/work/qt/qtdoc/tests/auto/quick/examples/tst_examples.cpp(261)]
...