The second is during long use sessions, often when switching between chat apps and watching reels on Instagram. The phone gets hot in the space on the right side, across the bottom of the camera island. This is without gaming, without being plugged in for a charge, and on Wi-Fi, so the heat is inexplicable.
Many other users on X (the platform formerly known as Twitter) have also experienced the same. This includes many prominent reviewers and early adopters who have a lot of experience working with phones.