How can dual nationals who hold a green card in China change their nationality registration?

Since China does not recognize dual nationality, even if foreigners have dual nationality, they can't change the computer of the entry-exit administration office, and they don't want to do so. Therefore, it is determined that China's green card is related to the Costa Rican passport, while the Australian is another person and has nothing to do with this green card.

For you to enter and leave China, a green card is a green card, so it doesn't matter what your original nationality is.

If you must change it, you have to go through the formalities of applying for a green card with a Colombian passport again.