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Maybe.......
More info regarding calibre, storage conditions.......as much as you can provide would be helpful.
The brass may have suffered stress corrosion cracking in the green areas.
Or it may only be copper patina which is surface corrosion...leading to imperfections.
If it's only a few rounds (like 50-100)......it's not worth worrying about........chuck it. Unless it's a rare cartridge.