Qt 5.14.1 - Crash in debug when updating diffuse component of Qt3DExtras::QDiffuseSpecularMaterial

When updating the diffuse property of Qt3DExtras::QDiffuseSpecularMaterial on an entity in the 3D scene, the program crashes when running in debug mode with the following message:

Module: 5.14.1
File: aspects\qabstractaspect.cpp

Line: 213

ASSERT: "metaObj" in file aspects\qabstractaspect.cpp, line 213.

Crash does not occur in release mode, nor does it occur when changing the ambient property of Qt3DExtras::QDiffuseSpecularMaterial in either mode.

Crash does not occur when running the same program with Qt 5.12.1

Attached a small working example with buttons to change the ambient and diffuse property of the material of the sphere in the 3D scene.

Confirmed that the same behavior occurs when the 3D scene contains a torus instead of a sphere.