Small Exposure Anomaly with Q3

[SAronian]

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I've been shooting Continuous - 4 fps / 14 bit / AF to avoid shutter blackout. Just noticed the first image is slightly darker than all subsequent images. This is the same for both JPEG and RAW. When tripod mounted, with a static subject and full daylight, this is repeatable with each series. I'm using autofocus and aperture preferred.

It's even recorded in the metadata -

First exposure - 1/800 sec f/8 ISO 100

Subsequent exposures - 1/640 sec f/8 ISO 100