Emissive texture not working

Hi all!

I've been working on supporting substance materials on our renderer using the amazing sbsar plugin provided here.

Substance materials look great, but the emissive textures don't look right. Here is how it looks:

But the emissive texture png generated looks like this:

Increasing the intensity just makes the render look like this:

I also uploaded the .usda file, and the .sbsar converted to .usda, in .txt format because .usda and .sbsar can't be uploaded here...

[burning_coals_usda.txt](https://github.com/user-attachments/files/26364030/burning_coals_usda.txt)
[burning_coals_sbsar.txt](https://github.com/user-attachments/files/26364048/burning_coals_sbsar.txt)

I also attached below all the texture pngs generated:

I have many test assets and the others are working fine, it is this asset with the emissive texture has a problem. For reference, here is an asset with a blue ceramic tile substance material:

I'd appreciate any help I can get, this community has been a godsend to me the last time when I was first trying to get this to work :)