there are a ghost touch bug for iphone 11. Its so annoying, i haven't seen a bug like this before ios 26.4.2 update
Ios 26.4.2 Bug (iphone 11)
iOS 26.4.2 was released in April 22 and seems like you reporting a bug, I would recommend you to post that on the communities or you open a bug against that version.
Your question seems related to a consumer feature and is better suited for the Apple Support Communities
https://discussions.apple.com/welcome
Or file a bug. If you have any questions about filing a bug report, take a look at Bug Reporting: How and Why?
Albert Worldwide Developer Relations.