Shanghai Disneyland has again shut its gates indefinitely due to COVID-19 concerns. This time, however, Monday's abrupt closure left guests stuck inside the theme park unable to leave until they produced a negative COVID test. The guests were not immediately permitted to leave Shanghai Disneyland due to China's zero-COVID policy, the BBC reported. Like other businesses operating in Shanghai, Disney is required to follow standard procedures, a Disney spokesperson told CNET via email. The testing on all guests came back with negative results, a Disney spokesperson said, and all exited the park by early Tuesday. Video was posted on social…