It seems there is no way via the UI to rename a material that is currently being used in a pipeline other than editing the XML directly. If you try and edit either one GO will flag it as a validation issue either because it is being used (i.e. when renaming a material) or because it is not defined (i.e. when renaming a material reference).
This is also true for properties, env variables and the like. A little frustrating to work without the ability to rename anything via the UI if it is already being used.
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