Hello there,
Got a similar problem but when I would toggle on True Tone, Display Brightness would become completely crazy and would almost go from sealer screen to putting a grayish layer to the point I could not even see.. It seems to me that the system is trying to adjust the brightness according to the ambient light sensor but macOS Big Sur being at its earliest stages is unable to resolve that at the moment.
I am gone have to test tonight and report here.
Wishing you a very good afternoon.
Puffincendre
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BigSur introduced a new csrutil with this: csrutil authenticated-root status
Boot in BigSur Recovery and type in the terminal csrutil authenticated-root disable, this is the "new BigSur SIP disabled" (from my current BigSur normal booting terminal)
The reboot back to your desktop and type csrutil authenticated-root status and see if you et disabled. You should now to be able to change your permission.
If not post back, I will try to see what I can do..
Didi you install macOS Big Sur fresh? Or was it installed from macOS Catalina?
Do you have a link where I can get the DTK? Thank you...