UnityARKitPlugin Camera error!

My Unity AR game’s camera works normally on iPhone 6S and iPad but get an error on iPhone 8 plus and later:
There are 2 cameras on the screen as you can see in the video. How to fix that problem?

Video and documents:
https://husteduvn-my.sharepoint.com/:f:/g/personal/hung_lm142072_sis_hust_edu_vn/EtnjC7ixNRpLqMnCNu541_MB4PTZDsaoNJ1RfCnzusQaHg?e=6kwssR

Thanks in advance!

Looks like a UV (wrapping) issue.
Are you using a custom ARBackground-shader?

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A bit of insight from the team:

This is a known issue with the UnityARKitPlugin. This was an external plugin that is now deprecated and unsupported by Unity.