USD not exporting transparant decals

Hi, I'm trying to export some unity assets as USDZ files so they can be used in a webshop.
We wrote a custom exporter on top of USD to automate removing some gameobjects that are not needed in the USDZ file.

But the transparant decals are exported as opaque objects. Probably because the images are not exported.
Does anyone know how to fix this?

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8178488--1064978--Screenshot 2022-06-03 at 14.43.04.png 8178488--1064981--Screenshot 2022-06-03 at 14.43.17.png 8178488--1064984--Screenshot 2022-06-03 at 14.43.21.png

Moving the post from AR Forums to a more appropriate forum: Formats & External Tools Previews.