to recreate:

• set Action Bar 1 Dragonriding override to Action Bar 11

• for argument's sake, since it won't actually do anything, set Action Bar 2 Dragonriding override to Action Bar 11
  -create a macro with includes the command /swapactionbar 1 2

• drag the example macro to a slot on Action Bar 1

• verify that the Dragonflying override works by mounting your dragon
  dismount

• click the example macro. Action Bar 1 now shows Action Bar 2. however, if you left-click Dominos and enter configuration mode, you'll see that Dominos still considers it to be Action Bar 1

• mount Dragon and note that the override doesn't work, even though both Bar 1 and 2 have been set to use overide.

This is intentional. Dominos evaluates paging in the following order:

1. Modifiers
2. Quick paging (You're triggering the [actionpage:2] condition via the swapactionbar command)
3. Class specific paging (which includes dragon riding)

You can edit barStates.lua, but that's about it. The I've set the priority is so that you can be in a stance (or flying), and then use a quick page or modifier to switch to a different bar temporarily, and then switch back once more when you're done.