A user on the official Oneplus forum has posted and mentioned that he got the notification for Oxygen OS Open Beta 8 update. The user got the notification for the update through Oneplus Updater.
The user also mentioned that the update arrived on his Oneplus 7 Pro device which is currently running on Open Beta 7.
Talking about the new beta update. The update file weighs 2243MB in size and brings a number of system improvements like optimization for mistouches and system stability. And other than this, the update brings fix for black screen issue in camera and display issue on uninstalling page. The Oxygen OS Open Beta 8 update also brings the latest Android security patch; December security patch.
You can check out the full update log below.
Optimized the mistouches when the phone was in pocket
Fixed the display issue on the uninstalling page
Updated Android security patch to 2019.12Improved system stability and fixed general bug
• Fixed the crash issue while opening the App
• Fixed the black screen issue