iPhone 11 iOS 18.6.1 AirPods Pro 2 microphone no longer works during phone calls

Since updating to iOS 18.6.1 on iPhone 11, the microphone of the AirPods Pro 2 no longer works during phone calls.

The microphone does work, for example, when listening to music — it correctly detects conversations.

Have you encountered this issue?

Have you managed to fix it?