A student told me that during a tournament they went to, the head ref explained that if a team pushes a mobile goal out of a positive corner while also possessing a different mobile goal, the 'violating' mobile goal has its positive bonus revoked. I haven't seen this rule stated specifically. Is this a defined rule or is this the head ref placing their own rules on competing teams?
The official VEX V5 Robotics Competition Question & Answer system has closed for this season. If your team is planning to attend the 2025 VEX Robotics World Championship, you may submit game and event-related questions to the 2025 VEX Robotics World Championship Driver's Meeting Question Collection Form, which is available at this link: https://forms.gle/VpoRH5GmhktejJ8R8.
Official Q&A: VEX V5 Robotics Competition 2024-2025: High Stakes
2270: Mobile Goals losing + Corner Status (SG6)
We're a bit confused by your question, and we're guessing that you mean "pushes a mobile goal into a positive corner" rather than "out of" because there otherwise wouldn't be a Mobile Goal in the Positive Corner to have its bonus revoked. We're going to answer your question from that perspective. If we're wrong, please feel free to rephrase and resubmit.
An intentional Violation of <SG6> as described in your question would result in a Major Violation and Disqualification for the offending Robot if they win the Match, as specified by that rule's Violation Notes. There is no rule in the game manual that would result in a Mobile Goal's Corner modifier being revoked due to a rule Violation.