NUC: neptune3-ui-qsr-cluster and QWindow raster example don't render on boot2qt image with eglfs platform

For 5.12.0 on pelux image neptune3-ui-qsr-cluster app (rendering part is based on Qt Raster Window Example https://doc.qt.io/qt-5/qtgui-rasterwindow-example.html) rendered OK.

On 5.13.0 boot2qt and pelux images app starts, but no rendering happens, terminal output remains on the screens.  Warning message appears on calling flush() function on render:

Attempted flush to non-raster surface SafeWindow(0x7fff55ab7ed0) of type QSurface::OpenGLSurface

App renders correctly with linuxfb platform.

Same for mentioned Raster Window Example

Not sure whether it is a bug or not and where to place it, maybe it is more of Qt-related