The button of (wired) earphone does not work.

I was using my iPhone SE(1st Gen.) with iOS 13.7.

Last week, I upgraded it to iOS 15.3.1 and I found there is a problem today.

My earphone(wired, bundle) dosen't work well.

When a call comes, I cannot receive the call by pressing the center of earphone button.

Volume control(+/-) works good.

Only the action by pressing center does not work after iOS 15.3.1 upgraded.

Why this happened?

Apple does not like using wired earphone anymore?