Little harm to tree. Damage to the veneer
The arrows point to the tracks of the cambium miners.
You see three growth increments in a cross section or as we call it "Transverse".
Here we see 3 increments - 1-3. As that increment was growing and the cambium zone was located in that spatial position, the Miners swam through, in a sense leaving these markings. They went through as the tree was going from spring wood to summer wood. 1-3 are cambium miners tracks. Not harmful to the single tree or the system.
Image source (SHIGO 2002)
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John A. Keslick, Jr.