ID 399902 - The Advanced viewport isn't showing transparency correctly within the 3D viewport.

Problem summary

The Advanced viewport isn't showing transparency correctly within the 3D viewport.

Transparent parts of this model aren't being shown as transparent in the Advanced viewport.

Customer reported version
modo.13.0v1

Customer reported platform
windows10

Steps to reproduce

1) Download and open the attached file.

2) Switch to the Advanced viewport.

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3) Press the F9 key to bring up the Render window, and compare the rendered image with the model in the 3D viewport, notice how the transparent parts aren't being shown correctly within the 3D viewport.

Expected behaviour
Parts of the model should be shown as transparent in the 3D viewport.

Actual behaviour
The transparent parts aren't shown as transparent.

Workaround
Unknown.

Reproduced by support

This bug has been reproduced in:

Modo 13.0v1 - Windows 10 - Centos 7 - MacOS 10.13

Modo 12.2v2 - Windows 10

Modo 12.1v2 - Windows 10

Modo 12.1v1 - Windows 10 - Centos 7 - MacOS 10.13 -regression

Unable to reproduce bug in:

Modo 12.0v1 - Windows 10 - Centos 7 - MacOS 10.13

Earliest version tested

Modo 12.0v1 - This issue no longer appears in this version and has regressed.