[Ygorl]

I don't think that's a clear loophole... The way I read the charter, and the way I think people have been understanding it, is that a province that is contested is controlled by both players, and so either can commit forces - but a third party cannot attack that province, unless that third party has a right to attack one or the other controlling nations.

So, I don't think anything needs fixing, there. Of course, y'all might disagree...