ID 467918 - Shader properties do not appear when the Shader is selected in the Items List after a Material has been selected in the Shading tab

Problem summary
Shader properties do not appear when the Shader is selected in the Items List after a Material has been selected in the Shading tab

Customer reported version
Modo 14.2v2

Customer reported platform
Windows 10

Steps to reproduce

1) Create a cube (Geometry > Unit Primitives > In Current Mesh > Cube)

2) Add a Shader to the cube by right clicking it in the Item List, and selecting Shade > Create Item Shader

3) Click the Shading tab and select the Base Material in the shader tree. 

4) Open the Material Ref tab in the properties panel

5) Click the Items tab and select the previously created Shader in the Items List (Click the '+' button next to the mesh to reveal the Shader)

Expected behaviour
The properties panel should update to show the Shader's properties

Actual behaviour
The properties panel still shows the Base Material's properties

Workaround
If a seperate Scene in the Item List is selected before clicking the Shader, the Shader's properties will appear as expected

Reproduced by support
This bug has been reproduced in:
Modo 14.2v2 - Windows 10 - CentOS 7.5
Modo 14.2v1 - Windows 10 - CentOS 7.5 - Regression

Unable to reproduce bug in:
Modo 14.1v3 - Windows 10 - CentOS 7.5 

Earliest version tested
Modo 14.1v3 - This issue doesn't appear in this version and has regressed