By the OP's admission, they were late with some of their payments, and the Chinese counterparty could conceivably have some kind of a legal case against them. In which case, being in China could open them to getting sued in Chinese courts, which can be a tricky situation for Westerners. Not least because (as in this case), it can get difficult to leave the country once the case is in the courts.
(The linked article describes a case where a businessman was stopped at the airport because of a $250,000 lawsuit that he says he was unaware of. He was only able to leave after his family found the money.)
By the OP's admission, they were late with some of their payments, and the Chinese counterparty could conceivably have some kind of a legal case against them. In which case, being in China could open them to getting sued in Chinese courts, which can be a tricky situation for Westerners. Not least because (as in this case), it can get difficult to leave the country once the case is in the courts.
(The linked article describes a case where a businessman was stopped at the airport because of a $250,000 lawsuit that he says he was unaware of. He was only able to leave after his family found the money.)