Yes.
My Little Pony Issue 18 (Not a lot of context but the statement):
"THE ROUTE TO THE THRONE ROOM SEEMS TO BE THE SAME AS THE OTHER CANTERLOT. COULD THERE BE MORE ALTERNATE UNIVERSES OUT THERE? WHO ARE WE IN EACH ONE OF THEM? THERE'S AN INFINITE NUMBER OF POSSIBLE SELVES! AND OF THOSE SELVES, WHO IS THE REAL YOU? IT'S FASCINATING. TRULY A LIFETIME OF RESEARCH IS TO BE HAD IN THE SIMPLE IDEA OF TRAVERSING THE INTERDIMENSIONAL COSMOS! EEE!"
A lot of story context but not a lot for the feat itself. Essentially Celestia making fun of Luna's lack of progress with Magic tries a risky interdimensional portal and ends up spirited into another reality. Then Celestia talks to Starswirl about how Luna heard a voice when she did a spell, Starswirl mentions that's quite dangerous, Celestia asks why, and then Starswirl mentions that because there is an infinite number of realities, there are entities far more evil than they can ever imagine/dream, that the spell connected her to one of those doors, and one of said evils may have been talking to her
Also not a lot of context. This is about as blatantly 'you see what you get' .
Also another one where we don't get a lot of context for the Infinite Corridor other than what we said
The last one unfortunately doesn't give more context other than just that there is another Dreamscape.