Stranger Things on UHD disc is also without HDR.
Just to add a bit of clarity, Season 1 of Stranger Things is SDR in both UHD and Netflix. Season 2 includes HDR for both UHD and Netflix.
Although I believe the season 2 UHD is HDR10 only, while one Netflix it is DV/HDR10...
My 2019 TCL 6-Series QLED R625 Calibrated Settings