Photoshop Export fails when a Black Mask is present in Substance Painter 12.1.0

Environment

• Adobe Substance 3D Painter 12.1.0

• Photoshop Export plugin 1.1.9

• Windows 11

• Adobe Photoshop (latest Creative Cloud version)

Issue

After updating from Substance Painter 12.0.3 to 12.1.0, Photoshop Export no longer works if a layer has a Black Mask.

Regular texture export works correctly. Only Export to Photoshop fails.

The issue is reproducible even in a brand-new project.

Steps to Reproduce

1. Create a new project.

2. Add a Fill Layer.

3. Add a Black Mask to the Fill Layer.

4. Click Export to Photoshop.

5. The export fails.

Expected Result

The Photoshop (.psd) file should be created normally, including the layer masks.

Actual Result

The export stops while generating the temporary mask PNGs.

The log shows:

[Plugin - photoshop-export] An error occurred while exporting map "..._mask.png"

[MapExporter] Nothing could be exported from the Material Stack:
[MapExporter]     Channel "Blending mask" cannot be used with the Material Stack.

Additional Information

• The issue occurs in both existing projects and completely new projects.

• Removing the Black Mask allows Photoshop Export to complete.

• Standard Export Textures works correctly.

• The exact same workflow works correctly in Substance Painter 12.0.3.

• Therefore, this appears to be a regression introduced in 12.1.0.

I also tested by disabling any user-installed Photoshop Export plugin under the Documents folder, but the issue remained.

If needed, I can provide a minimal project file that reproduces the problem.


[Moved to Substance 3D Painter by a moderator］