The OnePlus 9RT is the latest device OnePlus released, and is currently only available in China (after being announced on October 13th). It is expected to be sold in India as well, although OnePlus has been weirdly enough quite silencious about it.
Devices seems to have been shipped recently in China, as the first OTA with September 2021 Android security patch level went live few days ago, essentially bringing bug fixes and improving system stability. In fact, community member MlgmXyysd managed to capture the full OTA link and posted it on Telegram. From there, we have been able to dump the ROM and extract independently both static and live wallpapers (we've noticed while finalizing this article that static wallpapers have been pulled from a unit on November 6th 2021). You can download them from Google Drive or MEGA should you wish to see them in high resolution.
To set these live wallpapers as your lock screen and home screen wallpapers, you can use the free application Video to Wallpaper. Click on the "+" icon to select wallpaper path, and then tap on the "Apply" button as shown in this screen record from a OnePlus Nord N10 5G.
OnePlus holds the copyright to these wallpapers. They should not be used for commercial purposes.