When I removed the "one reason" restriction when directly sending the prompt to GPT-4 myself, it listed 9 possible reasons for terrible pancakes (of which leavening agent was one of them), all of which made sense based on my own experience of making American style pancakes.
I also tried translating the prompt into Mandarin while retaining the "one reason" restriction. Both Google Translate and GPT-4's translated versions did not receive "leavening agent missing" as an answer but instead were focused on cooking technique or other ingredients. Baking soda is very rarely used in home cooking in China, so perhaps training materials in Chinese had much less frequent mentions of it compared to English-based ones.
I also tried translating the prompt into Mandarin while retaining the "one reason" restriction. Both Google Translate and GPT-4's translated versions did not receive "leavening agent missing" as an answer but instead were focused on cooking technique or other ingredients. Baking soda is very rarely used in home cooking in China, so perhaps training materials in Chinese had much less frequent mentions of it compared to English-based ones.