Crash with modified particles affectors/groupgoal example

When increasing example particles amount a bit, getting a crash/assert. Modify for example line "emitRate: 4" -> "emitRate: 40" and after running for few seconds:

ASSERT failure in QList::operator[]: "index out of range", file C:\qt6-build\qtbase\include\QtCore\../../../../qt6/qtbase/src/corelib/tools/qlist.h, line 308 C:\qt6-build\qtbase\include\QtCore\../../../../qt6/qtbase/src/corelib/tools/qlist.h: 308

Debug output shows this is coming from qquickimageparticle.cpp line 1204 "return m_shadowData[datum->groupId][datum->index];".