@randy might be on the money here. Strange Things happen when image resolution isn’t divisible by 4 due to legacy code from the 90s that still beats deep within Flame’s dark heart. Try throwing a center/crop resize on the STmap out to 3232 x 2424 and see if the error goes away? It might break your roundtripping, but hopefully 2 extra pixels in each dimension won’t be noticeable.
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