I haven’t made a classic dashboard in a couple years, so I am rusty on this. But what exactly is your export process?
I found this from back in the day:
But I feel like that is not needed anymore.
Let me back up a bit.
If you make an “Application” in dev (from scratch; not from a classic dashboard), you can (depending on version) export the base app and export one or more layers (plus any needed BAQs/EFx of course) and import all of that into production without ever touching a classic dashboard interface.
OTOH, if the “Application” is a converted classic dashboard, well frankly I don’t know how those import over, whether you need to do additional steps.
But I assume not; once it is an Application, you should be good to export it as such with no trace that it was ever a classic dashboard.
I hope.