I have finally had a chance to take a look here. I will introduce a bad fix into the next beta. With that artifact in place (the one on the left which I believe is due to very dark overscan regions) this fix might or might not address the image history issues (more data required to validate that). What it should address is (and I'm not sure if you ever experienced this issue) is the problem where auto focus frames with this overscan artifact would return no stars.
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