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It's because the menu framerate is uncapped on console, it just runs at full beans pushing as much power as it possibly can to get the highest performance it can.It's just the menu guys, this has nothing to do with RT or anything, there's zero RT in this game apart from Quality mode that targets 30fps.
I've encountered it once or twice on PC too when a game menu made it sweat more than it should.
Maybe Hogwarts does it on PC too, don't remember but I'll check later.
There are a few other games that have the same problem. On PC, if you implement an FPS cap it applies it across the whole game (including menus) so you won't notice it.