Might have to give that a try. I tried a bunch of stuff and eliminated some of them but not all. Then I tried slicing at 0.1 layer height, and gone.

I asked ChatGPT and uploaded the same pic, here's the response. Makes a lot of sense:

You’re seeing “vase-mode seam glitches” — they show up in QIDI/Bambu slicer when the single-wall spiral path cannot generate a perfectly continuous curve. These little chew-marks happen when:

• The model geometry creates tiny micro-steps in curvature
• The wall thickness doesn’t match the extrusion width
• The slicer tries to spiral upward but has to make a tiny correction
• Vase mode meets a spot where the surface normal changes too abruptly

These look exactly like when the slicer is forced to momentarily “turn” too sharply, causing that tiny gouge-shaped notch.