Thanks @Rodrigo, I have solved the problem. Now it works but the jump in iOS is still happening.
Thanks @mvaneijgen, but the problem is not about the clip-path animation. Thanks btw
There is a little jump when you scroll into the pinned section (mobile viewport, safari, iOS). I have tried:
adjunting start trigger
adjusting end values
adjusting scrub
disable / enable pinSpacing
adjunsting pinSpacing