This may be because of Chinese characters in the fields. I haven't debugged that far yet. But there is definitely an issue here. Some body fields and text areas output no content at all when Insert Block is enabled for the input format used.

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Nick Robillard’s picture

Nick Robillard commented

I've removed all Chinese characters and this is still broken. The problematic field is a Long Text textarea and the input format most definitely has Insert Block enabled (with no other filters in order to remove the possibility of something else messing this up).