ID 462243 - Clone Stamp/Towbrush does not work on an object that was duplicated with its shading network

Problem summary
The Clone Stamp brush does not work on an object that was duplicated with its shading network.

With Example Head you can source the eye for the Stamp Clone/Towbrush and it will paint the eye onto the head.

Customer reported version
Mari 4.6

Customer reported platform

N/A

Steps to reproduce

1) Open Example Head

2) Duplicate Head_Geo from objects palette by right-click>Duplicate>Object and Shader Network

3) Select the duplicated object and the Diffuse_Color layer

4) Select the Clone Stamp brush

5) Try to modify the texture

Expected behaviour
The texture is edited

Actual behaviour
Nothing

Reproduced by support

This bug has been reproduced in:
4.6v4 - Windows 10 - macOS High Sierra - CentOS 7

4.6v1 - Windows 10 - CentOS 7

Unable to reproduce bug in:
4.5v1 - Windows 10 - CentOS 7

Earliest version tested
4.5v1 - This issue doesn't appear in this version and has regressed