JBJ2 replied at 2019-06-17 06:32:40
Note that Head of POCOPHONE Global mentioned that dark mode will available on MIUI 11 since it is being testing on few devices like RN7 and RN5 which has more user-base and will release to all devices with MIUI 11.
For notification patch, it might available on MIUI 11 since devs are focusing on optimization and stabilization so new features are planned for MIUI 11.
For other issues, please submit bug report via Feedback.

Notification is work very fine in beta why not add in stable.