There's a major bug in the underlying XML support (#2742233: parentXpathCache/parentElementsOfInterest does not work) that prevents comment migration from working. There shouldn't be anything we need to do in wordpress_migrate to deal with this - once migrate_plus is fixed it should just work - but I want to leave this issue open as a signpost for anyone who misses the mention of this in the README and looks in the issue queue for why comments don't work.

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mikeryan created an issue.