They do not show in the export of "all" of the artboards if the group is moved.
Is being able to group artboards intentional? as trying to move a group with artboards ignores the group and moves just the artboard?
Exporting all artboards also ignores any layers you might have under the artboards which would be pretty cool to have, right now I have an image of a store layout that I need to make graphic designs for, I have an artboard for each spot which makes it easy to visualize.