The issue seems to may be with identical post_date on both a revision and a post. As the data is transferred into the DB, the revision goes first and when the post hits it, the DB sees it as already existing and so does not transfer the actual post.
First check:
Post type
Date
I’m not sure how it ended up with duplicate dates and times but, in my case, I think it has to do with moving some of these posts multiple times – out of and into different test blogs during development.
The solution I used was to go into the exporting DB prior to export and delete anything where post_type = "revision". Then do the regular WP export / import.
Should work fine.