If you still want to try the OxygenOS 12 Open Beta 1 on your Nord CE 2 5G, you can head to the source link below for more details. And if you create a clone of WhatsApp using the App Cloner feature, the cloned version might not play the sound when the smartphone's connected to wireless earphones.
Although there the name of the update is different, the changelogs. For starters, the time on the AOD is displayed abnormally, and video details don't include the location information. The new update version for these OnePlus 6 is Oxygen Open Beta 22 and for the top-end, OnePlus 6T it is OxygenOS Open Beta 14.