Image Tracked Object doesn't follow the tracked image

Unity Engine
,
1

ARFoundation 5.1
When an image is tracked, I instantiate an object as the child of the tracked Image.
The problem is the child object will not follow the tracked images frame by frame,
it freeze a bit then follow the image.

I found the problem came from trackedImagesChanged ,
which didn’t occur when image moved.
The problems happen on iPhone 14\15pro with iOS16\17, even to Official Samples
It never happen in ARF 4.

BTW, alternately any way to check trackedImagedsChanged in Update()?

2

Please file a bug: Unity QA: Building quality with passion. There is not another way to check for tracked images changed. Our image tracking code did not change between these versions, so I’m not sure what’s going on here based on your report.