Prefix Parameter Names not implemented

Development Rendering
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1

I don’t know for how long but the “Prefix Parameter Names” tickbox is a non functioning tickbox. The feature does not seem to be implemented. Checking the engine code, it leads to a bool that’s not referenced anywhere else. This bit of code below is the only thing that exists about this feature. Am I missing something here?

/** If true, parameters in this function will have a prefix added to their group name. */ UPROPERTY(EditAnywhere, Category=MaterialFunction) uint8 bPrefixParameterNames:1;

2

Steps to Reproduce
Open up any material function. Click “Prefix Parameter Names”.

3

Hi, this property has been deprecated in 5.6 and will be removed in future versions of Unreal since it doesn’t function. It was added to the code base 8 years ago as part of some experimental material layering code that would prefix material parameter names w/ the material function it was contained in.