I also tested the export task using criteria in our qa/2.4.x branch, as follows:
In that test (which should be the same as 2.3, as we haven't yet changed much in the 2.4.x development branch that would affect this task, the export included the child records.
So... I'm not entirely sure why the tasks aren't working as expected in the 2.2 release, but I'm wondering if upgrading is an option for you? It should make achieving the end result you're seeking much easier.
I wish I had a better suggestion, but at first glance I don't see anything obviously wrong in the commands you've shared.
Cheers,
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