Please see the attached picture. I have some suspicion it could be caused by earwig or ladybug (Harmonia axyridis) or Anarsia lineatella.
I do not think it can be A. lineatella but ladybird adults, an earwig species (depending on where you found the damage) or also Cetonia aurata adults (in Europe) are able to cause a similar damage.
Peach Twig Borer is a possibility.
other than DNA gel extraction
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