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Are you scaling your darks?
I believe this artefact will cause issues if you scale your darks. I used to use 30min darks with my 8300 sensor and scale them, no major issues; however with the 16803, I can't get away with this because I can clearly see 1 or 2 darker columns, in addition to the fixed noise pattern generated from the RBI flash I apply. Now I've built 10, 15, 30min RBI flashed dark masters and will just match to those. If you use matched darks, don't subtract the bias, it's already within the dark anyway.
I guess just ensure you're not subtracting a bias from your subs and then subtracting a dark (non bias subtracted), else you're doubling up on the readnoise subtraction.
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