project-system: Attempting to change "Copy to output directory" after changing the build action from "C# compiler" -> "Content" fails

1. Select a C# file
2. In Properties, change build action from “C# compiler” -> “Content”:
3. Change “Copy to output directory” -> “Always”

Expected: For this to succeed Actual:

An error has occurred while saving the edited properties listed below:
	Copy to Output Directory
One or more values are invalid. Mismatched PageRule with the wrong ItemType.