Yes, still happening to me :( Version 19.0 SF according to the About in Max. I hadn't tried renaming a render element for a while, so not sure when this cropped up. Pretty sure it's a Max thing since it happens to all render elements irrespective of render engine.
I was thinking there might be some setting in Max to "always override to use a keyboard shortcut" that could have become enabled - renaming objects still works fine though.