uikit – iOS bizarre scale animation when Image in Image restore

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I am engaged on Image in Image for a customized participant, so I’ve to generate a AVSampleBufferDisplayLayer occasion first to instantiate AVPictureInPictureController. I couldn’t discover a full Apple demo for customized participant, so I’ve no clue about my present bizarre animation: the participant layer all the time does a scale animation earlier than it utterly stops

I attempted setting every related View.contentMode, however it did not work.
It merely clicked the Restore button within the window of PiP, after which It scaled animation did’t getting into the code I might management.