If your TV or projector doesn't support 4K @ 60 Hz, it's a Netflix app issue, afaik
, causing Roku to revert to a lower resolution for HDR.
Some displays may support 60 Hz but not for 4K HDR. In the case of the projector, it may be cable too long or simply not handling the bandwidth if it's capable of 60 Hz.
I believe the users with the Amazon Fire TV 4K Stick were complaining of same issue and Netflix was working it into an upcoming update but appears to be slow in coming. May be worth a try to report this to Netflix if your display is capable of HDR in lower refresh rates. Ask Netflix support to update the Roku app with HDR support for lower refresh rates, if that's the case.
I don't like Roku support's answer but getting support for such issues from Roku would be difficult. I think it's dismissive to not consider Netflix applications are impacting multiple displays and devices this way.
Just a thought: have you tried this with framerate auto switching enabled? If the app does allow HDR at lower refresh rates, maybe that requires the feature to be enabled, anyway. Framerate auto switching is off by default so user must enable it.
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