Xiaomi developers have released a new global beta version of MIUI 10.
The firmware was released under number 9.3.21
No new functions have been added to the firmware,but they fixed a huge number of different errors. For example, app notification light showing, screen recording error, device lock icon disappearing with face, screen flickering when unlocked in landscape orientation and many more. The full list can be viewed at the link.
Updated:MIUI 10 Global Beta 9.3.21 for Redmi Note 4, Redmi Note 4X, Redmi 5 Plus, Redmi 5 and Mi 9 smartphones is delayed due to bugs. Also, the firmware has not yet been released for Redmi S2, Redmi Note 5 and Redmi Note 5 Pro due to testing of Android Pie.