I'm building an iOS game with RealityKit + Reality Composer Pro and was hoping to migrate to Reality Composer Pro 3.
I created a new project in RCP and used the "link a new xcode project" flow. It built and rendered correctly on iOS 27.
However, I encountered two issues when trying to build for iOS 26.
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The new RealityKitScripting package threw an error indicating <iOS 27 is not supported. I removed the related code, as I do not intend on using any Script Graphs. The iOS 27 scene still loaded correctly after removing this package. Are there any other consequences to removing this package other than not being able to use Script Graphs?
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Once the scene loading was working on iOS 26, I noticed that no materials built with the Shader Graph would render. Unlit and Physically Based materials render correctly, but Shader Graph materials do not. Even a simple Shader Graph with one Unlit material node input would not work. Is this expected behavior?
My main question is, should I not expect to be able to use Reality Composer Pro 3 if I'm going to target an OS version <27?