Why is QtQuick creating multiple Open GL Render Contexts?

Additional info: Object creation call stack strace, retrived by gDEBugger, for Open GL Context 1: 0×62874bf3 – qwindowsd.dll 0×62874c96 – qwindowsd.dll 0×6287511d – qwindowsd.dll 0×628753f9 – qwindowsd.dll 0×6284a6ea – qwindowsd.dll 0×6284a71a – qwindowsd.dll 0×6284a610 – qwindowsd.dll 0×6284a688 – qwindowsd.dll ZN14QWindowPrivate6createEb – Qt5Guid.dll ZN7QWindow6createEv – Qt5Guid.dll ZN7QWindow10setVisibleEb – Qt5Guid.dll ZN24QQuickShaderEffectSource24scheduledUpdateCompletedEv – Qt5Quickd.dll ZN24QQuickShaderEffectSource24scheduledUpdateCompletedEv – Qt5Quickd.dll ZN24QQuickShaderEffectSource24scheduledUpdateCompletedEv – Qt5Quickd.dll ZN27QQmlFileSelectorInterceptor9interceptERK4QUrlN26QQmlAbstractUrlInterceptor8DataTypeE – Qt5Qmld.dll ZN20QQmlComponentPrivate8completeEP17QQmlEnginePrivatePNS_17ConstructionStateE – Qt5Qmld.dll ZN20QQmlComponentPrivate14completeCreateEv – Qt5Qmld.dll ZN13QQmlComponent14completeCreateEv – Qt5Qmld.dll ZN13QQmlComponent6createEP11QQmlContext – Qt5Qmld.dll ZN28QQmlApplicationEnginePrivate13_q_finishLoadEP7QObject – Qt5Qmld.dll ZN28QQmlApplicationEnginePrivate9startLoadERK4QUrlRK10QByteArrayb – Qt5Qmld.dll ZN21QQmlApplicationEngine4loadERK4QUrl – Qt5Qmld.dll 0×0040169d – DefaultQtQuick.exe 0×00402ac7 – DefaultQtQuick.exe 0×00402dcc – DefaultQtQuick.exe 0×004013dd – DefaultQtQuick.exe BaseThreadInitThunk – KERNEL32.DLL RtlTryAcquireSRWLockShared – ntdll.dll RtlTryAcquireSRWLockShared – ntdll.dll Object creation call stack strace, retrived by gDEBugger, for Open GL Context 2: 0×628738ab – qwindowsd.dll 0×62875e8d – qwindowsd.dll 0×628726d7 – qwindowsd.dll 0×6284a89f – qwindowsd.dll ZN14QOpenGLContext6createEv – Qt5Guid.dll ZN13QSGRenderLoop28handleContextCreationFailureEP12QQuickWindowb – Qt5Quickd.dll ZN12QQuickWindow9showEventEP10QShowEvent – Qt5Quickd.dll ZN7QWindow5eventEP6QEvent – Qt5Guid.dll ZN12QQuickWindow5eventEP6QEvent – Qt5Quickd.dll ZN23QCoreApplicationPrivate13notify_helperEP7QObjectP6QEvent – Qt5Cored.dll ZN16QCoreApplication6notifyEP7QObjectP6QEvent – Qt5Cored.dll ZN15QGuiApplication6notifyEP7QObjectP6QEvent – Qt5Guid.dll ZN16QCoreApplication14notifyInternalEP7QObjectP6QEvent – Qt5Cored.dll ZN18QOpenGLTimeMonitor11qt_metacallEN11QMetaObject4CallEiPPv – Qt5Guid.dll ZN7QWindow10setVisibleEb – Qt5Guid.dll ZN24QQuickShaderEffectSource24scheduledUpdateCompletedEv – Qt5Quickd.dll ZN24QQuickShaderEffectSource24scheduledUpdateCompletedEv – Qt5Quickd.dll ZN24QQuickShaderEffectSource24scheduledUpdateCompletedEv – Qt5Quickd.dll ZN27QQmlFileSelectorInterceptor9interceptERK4QUrlN26QQmlAbstractUrlInterceptor8DataTypeE – Qt5Qmld.dll ZN20QQmlComponentPrivate8completeEP17QQmlEnginePrivatePNS_17ConstructionStateE – Qt5Qmld.dll ZN20QQmlComponentPrivate14completeCreateEv – Qt5Qmld.dll ZN13QQmlComponent14completeCreateEv – Qt5Qmld.dll ZN13QQmlComponent6createEP11QQmlContext – Qt5Qmld.dll ZN28QQmlApplicationEnginePrivate13_q_finishLoadEP7QObject – Qt5Qmld.dll ZN28QQmlApplicationEnginePrivate9startLoadERK4QUrlRK10QByteArrayb – Qt5Qmld.dll ZN21QQmlApplicationEngine4loadERK4QUrl – Qt5Qmld.dll 0×0040169d – DefaultQtQuick.exe 0×00402ac7 – DefaultQtQuick.exe 0×00402dcc – DefaultQtQuick.exe 0×004013dd – DefaultQtQuick.exe BaseThreadInitThunk – KERNEL32.DLL RtlTryAcquireSRWLockShared – ntdll.dll RtlTryAcquireSRWLockShared – ntdll.dll