Test tst_Snippets::verify flaky since 9-Mar

Test tst_Snippets::verify started to flaky around 9-Mar. Mostly on ARM Mac, but also reported in Ubuntu 22.04.

agent:2023/03/22 23:24:06 build.go:402: 326: QWARN : tst_Snippets::verify(qtquickcontrols-material-attributes) QQmlComponent: Component is not ready
agent:2023/03/22 23:24:06 build.go:402: 326: FAIL! : tst_Snippets::verify(qtquickcontrols-material-attributes) '!root.isNull()' returned FALSE. (file:///Users/qt/work/qt/qtdeclarative/tests/auto/quickcontrols/snippets/../../../../src/quickcontrols/doc/snippets/qtquickcontrols-material-attributes.qml:69 Cannot assign to non-existent property "endY"
agent:2023/03/22 23:24:06 build.go:402: 326: )
agent:2023/03/22 23:24:06 build.go:402: 326: Loc: [/Users/qt/work/qt/qtdeclarative/tests/auto/quickcontrols/snippets/tst_snippets.cpp(75)]

History:
https://testresults.qt.io/grafana/d/3dhio4K7k/fastcheck-ci-test-info?var-testCase=tst_snippets&var-testFunction=verify&var-branch=dev&orgId=1&from=now-90d&to=now

Integration log:
https://testresults.qt.io/coin/api/log/qt/qtdeclarative/a35a4884886745b33fa593103d7080e7accf8b06/MacOSMacOS_12arm64MacOSMacOS_12arm64Clangqtci-macos-12-arm64TestOnly/592db0b55ae984dd518daafc0b23275fcc8c1712/forceRun/test_1685415668/log.txt.gz

Link to integration:
https://testresults.qt.io/coin/integration/qt/qt5/tasks/nightly1685413802