#set page(paper: "a4", numbering: "1")

#align(center, text(100pt)[
  Big size
])

// something

#pagebreak

Normal size

This produces the following two pages:

The expected result is that the page number's style is the same for both pages (normal size).

N.b. if the // something line is uncommented, then the word something appears in normal size and the page number also returns to the normal size.