tst_qqmlextensionplugin fails on macOS

/Users/qt/work/qt/qtdeclarative/tests/auto/qml/qqmlextensionplugin/target_wrapper.sh  ./tst_qqmlextensionplugin iidCheck
 ********* Start testing of tst_qqmlextensionplugin *********
 Config: Using QtTest library 5.6.2, Qt 5.6.2 (x86_64-little_endian-lp64 shared (dynamic) release build; by Clang 7.0.2 (clang-700.1.81) (Apple))
 PASS   : tst_qqmlextensionplugin::initTestCase()
 PASS   : tst_qqmlextensionplugin::iidCheck(libqmlfolderlistmodelplugin)
 FAIL!  : tst_qqmlextensionplugin::iidCheck(libqmlfolderlistmodelplugin) 'loader.load()' returned FALSE. ()
    Loc: [tst_qqmlextensionplugin.cpp(108)]
 PASS   : tst_qqmlextensionplugin::iidCheck(libqmlsettingsplugin)
 FAIL!  : tst_qqmlextensionplugin::iidCheck(libqmlsettingsplugin) 'loader.load()' returned FALSE. ()
    Loc: [tst_qqmlextensionplugin.cpp(108)]
 PASS   : tst_qqmlextensionplugin::iidCheck(libmodelsplugin)
 FAIL!  : tst_qqmlextensionplugin::iidCheck(libmodelsplugin) 'loader.load()' returned FALSE. ()
    Loc: [tst_qqmlextensionplugin.cpp(108)]
 PASS   : tst_qqmlextensionplugin::iidCheck(libqtqmlstatemachine)
 FAIL!  : tst_qqmlextensionplugin::iidCheck(libqtqmlstatemachine) 'loader.load()' returned FALSE. ()
    Loc: [tst_qqmlextensionplugin.cpp(108)]
 PASS   : tst_qqmlextensionplugin::iidCheck(libqmllocalstorageplugin)
 FAIL!  : tst_qqmlextensionplugin::iidCheck(libqmllocalstorageplugin) 'loader.load()' returned FALSE. ()
    Loc: [tst_qqmlextensionplugin.cpp(108)]
 PASS   : tst_qqmlextensionplugin::iidCheck(libparticlesplugin)
 FAIL!  : tst_qqmlextensionplugin::iidCheck(libparticlesplugin) 'loader.load()' returned FALSE. ()
    Loc: [tst_qqmlextensionplugin.cpp(108)]
 PASS   : tst_qqmlextensionplugin::iidCheck(libwindowplugin)
 FAIL!  : tst_qqmlextensionplugin::iidCheck(libwindowplugin) 'loader.load()' returned FALSE. ()
    Loc: [tst_qqmlextensionplugin.cpp(108)]
 PASS   : tst_qqmlextensionplugin::iidCheck(libqmlxmllistmodelplugin)
 FAIL!  : tst_qqmlextensionplugin::iidCheck(libqmlxmllistmodelplugin) 'loader.load()' returned FALSE. ()
    Loc: [tst_qqmlextensionplugin.cpp(108)]
 PASS   : tst_qqmlextensionplugin::iidCheck(libqtquick2plugin)
 FAIL!  : tst_qqmlextensionplugin::iidCheck(libqtquick2plugin) 'loader.load()' returned FALSE. ()
    Loc: [tst_qqmlextensionplugin.cpp(108)]
 PASS   : tst_qqmlextensionplugin::iidCheck(libqmltestplugin)
 FAIL!  : tst_qqmlextensionplugin::iidCheck(libqmltestplugin) 'loader.load()' returned FALSE. ()
    Loc: [tst_qqmlextensionplugin.cpp(108)]
 PASS   : tst_qqmlextensionplugin::cleanupTestCase()
 Totals: 12 passed, 10 failed, 0 skipped, 0 blacklisted
 ********* Finished testing of tst_qqmlextensionplugin *********
 QQml_removeValueTypeProvider: was asked to remove provider 0x10662f4c0 but it was not found
 QQml_removeValueTypeProvider: was asked to remove provider 0x10662f4c0 but it was not found
 make: *** [check] Error 10