ID 429006 - Alpha channels within PNG fails for "Ignore" when used as a Group Mask

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Problem summary
Alpha channels within PNG fails for "Ignore" when used as a Group Mask.

Customer reported version
modo.14.0v1

Customer reported platform
windows10

Steps to reproduce

  1. Open Modo in safe mode then load the attached file.
  2. Switch to Render layout then start Preview > correct result.
  3. In Shading tab expand Root material group then select PNG with Alpha channel image.
  4. Under Texture Layers vertical tab change Alpha Channel to Alpha Only  > correct result.
  5. Change Alpha Channel to Ignore.

Expected behaviour
Group masks should work using png alpha channels.

Actual behaviour
Group masks don't work using png alpha channels.

Workaround
Unknown.

Reproduced by support

This bug has been reproduced in:
14.0v1 - Windows 10

Unable to reproduce bug in:
13.2v1 - Windows 10

Earliest version tested

13.2v1 - This issue doesn't appear in this version and has regressed.

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