Cannot access color properties from ExpressionAnimation

[Youssef1313]

Describe the bug

var exp = _visual.Compositor.CreateExpressionAnimation("c1.R");
exp.SetColorParameter("c1", new() { R = 40 });
_visual.StartAnimation("TransformMatrix._42", exp);

An invalid subchannel was specified in the expression.

Steps to reproduce the bug

Expected behavior

No response

Screenshots

No response

NuGet package version

None

Windows version

No response

Additional context

No response

[ChewWorker]

It appears that you are defining a color animation and then trying to use that to transform a matrix component. That is not supported.

[Youssef1313]

@ChewWorker It is not really about setting it to transform matrix. But just accessing color channels in general.

[ChewWorker]

@Youssef1313 I'm sorry I don't understand. If it's not really about the transform matrix, why does the repro have the transform matrix in it? Is there still a problem if you eliminate that line?