While surely accidental, it’s probably a great cross-promotional moment for Disney, as they have a new Mary Poppins movie coming out next year.
Since Guardians of the Galaxy Vol. 2 came out the Mary Poppins moment has become the biggest takeaway, resulting in no end to the memes and even the release of a Funko Pop toy that sees Yondu dressed as the magical governess.
Unfortunately, principal photography on Mary Poppins Returns is already over and it would likely be too difficult to throw in a Guardians of the Galaxy reference in that film that made any sense in context.