ShaderGraphMaterial.getParameter(handle:) always return nil, is this expected behavior?

I've loaded a ShaderGraphMaterial from a RealityKit content bundle and I'm attempting to access the initial values of its parameters using getParameter(handle:), but this method appears to always return nil:

let shaderGraphMaterial = try await ShaderGraphMaterial(named: "MyMaterial", from: "MyFile")
        
let namedParameterValue = shaderGraphMaterial.getParameter(name: "myParameter")

// This prints the value of the `myParameter` parameter, as expected.
print("namedParameterValue = \(namedParameterValue)")

let handle = ShaderGraphMaterial.parameterHandle(name: "myParameter")
let handleParameterValue = shaderGraphMaterial.getParameter(handle: handle)

// Expected behavior: prints the value of the `myParameter` parameter, as above.
// Observed behavior: prints `nil`.
print("handleParameterValue = \(handleParameterValue)")

Is this expected behavior?

Based on the documentation at https://developer.apple.com/documentation/realitykit/shadergraphmaterial/getparameter(handle:) I'd expect getParameter(handle:) to return the value of the parameter, just as getParameter(name:) does.

I've tested this on iOS 18.5 and iOS 26.0 beta 2.

Assuming this getParameter(handle:) works as designed, is the following ShaderGraphMaterial extension an appropriate workaround, or can you recommend a better approach?

Thank you.

public extension ShaderGraphMaterial {

    /// Reassigns the values of all named material parameters using the handle-based API.
    ///
    /// This works around an issue where, at least as of RealityKit 26.0 beta 2 and
    /// earlier, `getParameter(handle:)` will always return `nil` when used to read the
    /// initial value of a shader graph material parameter read using
    /// `ShaderGraphMaterial(named:from:in:)`, whereas `getParameter(name:)` will work
    /// as expected.
    private mutating func copyNamedParametersToHandles() {
        for parameterName in self.parameterNames {
            if let value = self.getParameter(name: parameterName) {
                let handle = ShaderGraphMaterial.parameterHandle(name: parameterName)
                do {
                    try self.setParameter(handle: handle, value: value)
                } catch {
                    assertionFailure("Cannot set parameter value")
                }
            }
        }
    }

}