In Germany, the bag was stolen, which contained a passport and a hotel room card.

Please report the loss of your passport to the local police station as soon as possible, and then contact the local embassies and consulates in China to provide them with a copy of the loss report receipt, passport and visa. After they verify your identity in China, they will give you a certificate, with which you can leave the country. You can also do it at the consulate, which takes longer than the time to apply for a permit.