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[wierd]

In order for light to reach the disparate "bubbles", they have to be causally connected, which defacto requires them to share the same spacetime framework.

I can't really be civil about discussing things that cannot make sense. As such, I shall vacate the thread to help it retain civility. It is the best I can do.

[andrea]

I am not sure of what the point of the experiment is.
If the world worked that way... we would continue oblivious to the bubbles until we reached the edge of our, at which point we will require a lot of rewriting of physics books.
Any further consequence depends on how exactly the interstellar medium differs in properties from the star bubbles.

[Graknorke]

In order for light to reach the disparate "bubbles", they have to be causally connected, which defacto requires them to share the same spacetime framework.

Yes, that.
If there's no sort of space between the bubbles then you either wouldn't be able to send information from one to the other, or it wouldn't be consistent in the same way as you can look at a galaxy and see it there the next day. So if it's not space it's something that acts an awful lot like space.