Copying property values from specific section does not always work

Steps to reproduce:

• Create a new project
• Add QtQuick3D
• Create two materials
• Change the diffuse color of the material #1 to something else than the default #ffffff 
• Right-click material #2 in Material Browser and select "copy properties -> Diffuse"
• Right click material #1 in Material Browser and select "paste properties"
• -> would expect that diffuse color of material #1 changes to #ffffff as in material #2 but it stays the same
• Copying all properties from material #2 to material #1 works correctly changing the diffuse color too
• Copying diffuse property from material #2 to #1 also works if the diffuse color of material #2 is first changed to something else than default