Will Denmark be deprived of its permanent residency in China if it returns to China for more than one year in 2022?

Danish permanent residence in China for more than one year in 2022 will not be cancelled. When you immigrate, you choose to obtain permanent residency in the destination country, not naturalization. Getting permanent residency does not mean that you can hold it all the time. The right of permanent residence in most countries is conditional. The validity period of the permanent residence card is generally 10 years (need to be renewed). If certain conditions cannot be met, it cannot be renewed, and even the permanent residency that has been obtained will be cancelled.