I normally shoot with ProRaw on (for no real good reason honestly), but in the handful of time I've noticed the "double vision" with the baseline HEIC layer, I did not see the same effect while editing the ProRaw layer.and the photo exhibits the same issue elsewhere as well - very ugly. I think it's either stacked images or probably the IS "wobbling". It's not traditional camera shake as for example on the left side there are no such issues.
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ProRaw theoretically already includes Deep Fusion data, so maybe there's an extra layer of processing that has side effects.