qt3d examples require rhi plugin

When running qt3d most of examples like simple-cpp, compute-particles, controlsunderlay,  scene3d, etc. the app fails to find the rhi renderer and crashes.

Abort message:

Unable to find renderer plugin for rhi

 A workaround is to explicitly set the renderer to opengl

qputenv("QT3D_RENDERER", "opengl");

In  QTBUG-88670 jani-korteniemi mentioned that on 6.2.2. RHI renderer was disabled by default, but looks like it is still enabled in Qt 6.4.0 Beta4.