3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
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All seems to indicate something related to pressure advance, whereby the printer thinks it needs to extrude less because of some pressure buildup but it underestimates how much is really needed. Does it happen if you print slowly? E.g max 15 mm/s or less.
At 15mm/s, it looks like the underextrusion is about half the size.
https://imgur.com/a/F0sXBvJ
Interesting, that would confirm the pressure advance as the likely culprit (speed and acceleration are taken into account in the algo). Maybe your slicer has a bug related to this? If changing the value wildly does not improve or worsen it, then it might not be calculating what it's supposed to. Can you try another slicer?
I used an older Cura that I already had installed (instead of Orca 2 that I've been using) and the underextrusion pattern is different, but still there.
I turned pressure advance to 0 in both Orca and Klipper, and saw no difference. :(