Hi
I'm sorry but most probably this isn't something I can easily fix. To be able to blueprint upgraded roboports, I have an invisible extra entity placed on top of them that can be picked up by the blueprinting tool but of course this entity doesn't have any circuit network connection.
There are events for bluepint creation (that's how I'm able to swap a proper robport instead of the dummy entity during the BP creation process: I intercept the bp creation event and turn each dummy entity into a vanilla roboport), but I don't know if it's possible to work on the wire connections at this stage.
I need to do more research into this subject, if this is something I'm able to fix, it will be done in the next release!
Thanks