Even when i got my phone with the stock update, the night light was not working.
Thinking that the issue will not persist after updating, i updated the phone.
The issue was still there.
Going in depth, the screen is tinted amber even though it is set it to automatically turn on
at "Sunrise and Sunset". Manually setting the time also doesn't work.
While contacting the support they told me to:
1. Boot into safe mode.
2. Force Restart.
3. Factory reset.
Done all of the above, and still there is no workarounds.
Hope they rectify it in the "September Update" in November.