Last month, OnePlus developers released a failed test build of OxygenOS for the OnePlus 8 and OnePlus 8 Pro, and now they announced a new update with many fixes.
What is known
The firmware was named OxygenOS Open Beta 4. It added the November security patch, as well as optimized the interface for calls, alarms and the appearance of the Split-Screen function. The developers also fixed problems with NFC, slowdowns of the MX player application, an error with downloading programs from the Play Store, and much more.
When to expect
Users of the OxygenOS beta testing program have already started receiving the update. If you don’t have the firmware yet, you can download it through the Oxygen Updater app or on the XDA website.
Source: OnePlus Forum