ipados26 disconnect touches when 4 fingers clicked on it

on an iPad with iPadOS26, put 4 fingers on the screen on the same time, with only both fingers moving on the same time, the 4 fingers will be disconnected by the screen.

before i have upgraded it from iPadOS18.1 to iPadOS26.0, i have never encountered this issue before.

tested devices: iPad Air3 iPadOS26.0