Unable to rename Blueprint Custom Events Input Parameter to: "NEWPARAM"

In an Actor blueprint, creating a custom event with an input parameter and renaming said parameter to "NEWPARAM" will not rename the parameter.

Note: Renaming the parameter to another name, and then renaming to "NEWPARAM" will result in success. (See attached NOTE: RenameSuccess.mp4)

1. Open Unreal Engine 4.20, and create an Actor blueprint
2. Inside of Actor Blueprint's Event Graph, create a Custom Event
3. Add an Input Parameter
4. Change the default name of "NewParam" to "NEWPARAM"->Hit enter key

Result: Input Parameter "NEWPARAM" is renamed to "NewParam"

Expected: Input Parameter renamed to "NEWPARAM"

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