Here are several options for a formal English rewrite of the title, ranging from slightly modified to more substantially rephrased:

Option 1 (Direct & Concise):

Chinese AI Chatbots Underperform on Pro-China Misinformation Assessment

Option 2 (Neutral & Objective):

Performance of Chinese AI Chatbots on Pro-China Misinformation Evaluation

Option 3 (Focus on the Result):

Chinese AI Chatbots Fail to Meet Standards in Pro-China Misinformation Test

Option 4 (Analytical Tone):

An Evaluation of Chinese AI Chatbots’ Handling of Pro-China Misinformation

Option 5 (Most Formal/Report-Style):

An Assessment of Chinese AI Chatbots in a Pro-China Misinformation Task

All of these maintain the original meaning while adopting a more formal, professional tone suitable for reports, analyses, or academic contexts. Please let me know if you need any adjustments.