One would assume that the original BD is most likely what was intended:
And that the the UHD guys got carried away:
Personally, all the Harry Potter releases of this film look like garbage, likely because they were early adopters to their respective formats.
The BD came out a year after BD hit the market, as did the UHD.
The BD is plagued by a horrible VC-1 encode (presumable ported over from the HD-DVD).
The macro blocking in the dark areas is insane.
My son and I were joking that it looked like someone was playing Tetris in the shadows.
The UHD obviously went light canon mode with the HDR grade.
I’m sure glad I’m not a Harry Potter fan, these movies would drive me nuts!