Little known fact. If you’re Chinese, then by Chinese law you MUST work as an agent for Chinese intelligence if they want you to. It doesn’t matter if you’ve gotten citizenship someplace else. They will make you cooperate. Their students will get jobs in labs and copy records and data all while using funding from the hosts.
And that’s why any country governed by sane, intelligent, and patriot leaders would ban any and all Chinese from working in any labs.