Last month, Xiaomi began sending out the stable global Android 10 update to the Redmi Note 8 Pro. The rollout has been a slow one, and owners of the phone around the world are still receiving the OTA, but the update appears to have broken something.
Prior to the Android 10 update, the Redmi Note 8 Pro lacked Widevine DRM L1 certification, which meant owners of the phone were unable to stream HD content from Netflix and other such services. The Android 10 update fixed that but appears to have also disabled HDR support for Netflix. This means that Redmi Note 8 Pro owners on Android 10 are able to watch HD content on Netflix, but without HDR.
Also, going by user feedback on the Mi forums, while the Android 10 update implemented Widevine DRM L1, the Redmi Note 8 Pro is still unable to stream HD content on Amazon Prime. The whole thing is a mess, really, as the phone supports HD streaming on Netflix, and HDR on YouTube.