Substrate materials not showing after packaging – any workaround

Hello everyone,
I’m fairly new to Unreal Engine, so apologies in advance if this is a basic question.

I’m currently working on a project that relies on Substrate materials. I know it’s still in beta and marked as experimental. When I run the application inside the Unreal Editor, everything looks and works great. But after packaging the project, any mesh that uses a Substrate material just doesn’t show up.

Is this a known issue?
Does anyone know a workaround or how to get Substrate materials working properly in a packaged build?

Thanks a lot in advance!