I replied to some Flow topic and then ran a usercontribs query with my own name:
https://www.mediawiki.org/w/api.php?action=query&list=usercontribs&format=json&ucuser=Amire80
I saw other edits made before and after the Flow edits, but not the flow edits themselves.
If I explicitly request the topic namespace, I don't see anything at all:
https://www.mediawiki.org/w/api.php?action=query&list=usercontribs&format=json&ucuser=Amire80&ucnamespace=2600
Is this by design? If it is, then it's strange, because the usual Special:Contributions page does show Flow edits.