Render backend throws assert when running test app

When running the test app from https://bugreports.qt.io/browse/QT3DS-3656, it sometimes at the startup throws an assert from the render backend:

Assertion thrown: C:\dev\qsstudio3d\qt3dstudio\src\Runtime\ogl-runtime\src\render/backends/gl/Qt3DSOpenGLUtil.h 1642 false

The assert is caused by renderContext.CraeteAttributeLayout receiving invalid parameters for the entries. Somehow the static variables are initialized to zero.