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)
Result: Input Parameter "NEWPARAM" is renamed to "NewParam"
Expected: Input Parameter renamed to "NEWPARAM"
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-65154 in the post.