Hello ; Thank you for writing to us here and for the time taken to make this demonstrative image. Considering the description and the illustration the cooper plane is not covered with the soldermask oil so this is potential problem as you said already, please start a Quality complaint by sending an Email to [support@jlcpcb.com](mailto:support@jlcpcb.com) and you can add [jojo@jlcpcb.com](mailto:jojo@jlcpcb.com)  in CC in your Email. The support team will handle this well and will give you the appropriate assistance in this quality issue. We are counting on your understanding.