There is a quote in the book of Hebrews that is a direct quote from the Old Testament where is changes back to Lord or the verse would say Jesus is jehovah.
From my minor studies on the subject if the New Testament is to be taken at face value , it appears the Tetragrammaton is applied both to god and Christ equally. The addition and subjecting of the word jehovah really changes things. It’s not a minor change. It basically creates a new religion.
I am not really sure this is a rabbit hole I want to go down.