What your finger is under looks like poor pollination. It isn’t practical to work a vineyard to remove them. YES you could remove immature if you are doing manual desteming, here again it isn’t practical if one is larger scale and machine destems. The wineries that I get to see don’t do anything. If I was concerned as in steeping red grape I might ferment a day then rack off the green nubs that settle. Green grapes, ,, ie white juice are pressed which removes nubbies quickly.
The big question is do you find the taste objectionable?