OnePlus had recently released the very first OxygenOS Open Beta update for the OnePlus 6 that is based on Android 9 Pie, and the second one is already out, only a week after the first one got released. The second OxygenOS Open Beta update, which is actually called Open Beta 2, brings a number of optimizations and improvements to the table, while new features haven't been included in this update, and chances are we will not see new features in Open Beta updates anytime soon, as OnePlus will be looking to bring everything they released in the first Open Beta update to the stable channel as soon as possible, and after that the company can start pushing out new features as well.
Now, as far as the Open Beta 2 changelog is concerned, the company has brought several 'System' improvements. Wi-Fi connection stability has been improved in this update, while the company has also optimized background power consumption control, and also optimized the pocket mode to reduce accidental touches. As far as OxygenOS Launcher is concerned, its multi-tasking UI has been optimized, while front-facing camera image quality has been optimized as well. On top of all that, UI for Verification Codes (for OTP) in Messages has also been improved, OnePlus made it faster to find what you're looking for by doing this.
That is more or less it as far as the official changelog is concerned, and OnePlus also warned users of some problems that are still present in this beta build. OnePlus is warning those of you who are planning to install this beta update that some third-party applications may not function as expected, while Google Pay is not working at all. If you do decide to install this beta update, you will find all the necessary instructions in the source link down below, while you can also help the company by reporting any bugs via the Feedback tool that is built into its Community app which comes pre-installed.