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The dual rear camera has a beefy bracket that looks like it might offer some bendgate-proofing support for the delicate components.
The cameras are additionally secured to the rear case with some foam adhesive to keep things from jostling out of place. These cameras really need to stay put for Portrait Mode and similar features to work their magic.
Surrounding the camera housing cover glass, you can see tiny spot welds likely holding the walls of the camera bump to the case.