I’ve gone from 4.25 to 4.26 and can confirm I’m also having the same problems and others:
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APK over twice the size
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Framerate has gone from 60 to 30
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AR stops working when the AR session is restarted for the first time https://answers.unrealengine.com/questions/1000442/view.html#comment-1000442-form
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ARkit not working on older previously supported IOS devices AR Camera overlay not working in 4.26 (ARKit) - XR Development - Unreal Engine Forums