crash in scenegraph with material() being nullptr with gles on linux

Crash is observed when qt 5.15.9 is compiled for opengles only. No crash was observed qith debian 11  own qt 5.15.2 with gles packgages

The intention is to render texts using QSGGlyphNode, QSGGeometryNode and QSGTransformNode for a trend control implemenation.

Attached a sample application where we can reproduce the issue. When we start the application, a continuous switch between two texts "Hi" and "Hello" is expected with an interval of 100 msecs.

QSGNode are used to achieve that.

crash is here:
Thread 1 "Trend2" received signal SIGSEGV, Segmentation fault.
QSGBatchRenderer::hasMaterialWithBlending (n=0xaaaaaad0ab80) at scenegraph/coreapi/qsgbatchrenderer_p.h:221
221                                     : n->material()->flags() & QSGMaterial::Blending);
(gdb) p n->m_material
$5 = (QSGMaterial *) 0x0

we observed  QSGGeometryNode::setMaterial has not been called  for QSGGeometryNode

No crash was observed qith debian 11  own qt 5.15.2