The cutter deflects outward slightly when cutting and when raising/lowering Z for the tabs it is stationary in X/Y so it settles to its non-deflected location slightly inward from the rest of the path.
A finishing pass helps a lot but it may still be slightly visible. Maybe vibration while stationary in X/Y causes it to cut a bit extra at the ends of the tabs.
Oh yeah, that’s a pain in the ass. I’ve tried several different things to avoid those marks. Try thicker finishing pass offset. Helps, but not perfect depends on material also. Lately, I’ve been setting cutout depths to 1mm less than the thickness of the material with no tabs. After job is done run razor knife around part then sand the little bit off. No marks. That’s just what works for me.
Even if you have a VFD and can slow your spindle way down, four flute tools are designed for metal cutting. Their blunter cutting edges (smaller rake and clearance angles) and shallower flutes don’t cut or eject wood as well as two flute wood cutting tools.