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Is this possible?

Is it possible for the IBIS to move at 1/400th shutter speed while walking? I've been suspicious for a while but I just did a real test where it became clear that with stitching on (IBIS+RF 24-70 2.8), the image becomes blurry when walking. My camera is an R6 Mark II and I use an EFCS shutter.
The attached pictures show three consecutive photos taken while walking, with continuous focus on the wheel (Camera: R6 Mark II, Lens: RF 24-70 2.8, Focal length: 70mm, Aperture: f/5, Shutter: 1/400th). Only one of the three is sharp, the rest are blurred.
Has anyone experienced this? With R5 I think it's pretty much the same.

Thanks in advance.

Attachments

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    IBIS blur at 400th-0001.JPG
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    IBIS blur at 400th-0002.JPG
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  • IBIS blur at 400th-0003.JPG
    IBIS blur at 400th-0003.JPG
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