With this update, I'm having trouble with speakerphone on my iPhone 15 Pro: when I talk, whether using the phone app or WhatsApp, and only on speakerphone (no problem without it), the person I'm talking to doesn't always hear my voice, as if the microphone is interrupting. The microphones work fine, and I record audio with the bottom mic, the top mic, and the one next to the cameras without any issues. The speakerphone issue is temporarily resolved by toggling the "mute" button on and off, or by switching to speakerphone without speakerphone and then switching back to speakerphone. But it's temporary and starts working again after a few moments.
Before this 26.2.1 update, I hadn't had any problems. I know this is a problem on many iPhones (especially the 15) and has been discussed online for a few years, but it only appeared on me with this update.