Materials issues in PAK files

I’m having an issue when creating a PAK file and then loading it in my App. Basically, the materials are getting messed up. See the image below.

The material actually “animates” and moves around. you can see it in action here:

It almost looks like Z-depth fighting to me, but there is only one object there. The material is a default opaque material with a simple vector parameter plugged into the Base Color.

If the material exists in the compiled app then it works fine. But if the material is only in the PAK then I get this. I’ve tried it with a handful of materials and I get the same issue. I’m 99% certain it’s a material issue and not a mesh issue.

thanks\eric

Unreal 5.1
Platform: iOS (not sure if that makes a difference or not)

I’ve solved this.
Switching to Metal 3.0 fixed the issue.

thx-e

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