I'm a Beta user for iOS 26. I update my iPhone whenever there is an update. The issue that I found out is, "my Microphone is ON the whole day & night (24 x 7 - There is an orange dot in my dynamic island area), which is also draining my battery faster. The overall performance has also come down.
I gave microphone permission to only 3-4 apps (i.e. WhatsApp, WhatsApp Business, Alexa etc.), so there is no problem in the settings.
I'm attaching one image here, which shows that iPhone is cont. using my mic.