How can fix the problem looks like self-shadow flicker on ar device (ios ARkit)

Development Platform & Builds XR Development
1

i made a simple model and run it on an ipad(model: A1893) device. the self-shadow was turned off.

the problem is shown here:

thanks

2

This flickering is only on Ipad,it’s not on iphone8

3

set Metal V1.1 in project settings