Headers do not appear on first slides, but footers do.

[TravisWhitaker]

Please accept my apology if this winds up being a misunderstanding (FWIW I could not work out why this should be so from the documentation), but it seems that footers from the page function appear on all slides, but headers are excluded from the first slide.

Building this with Typst 0.12.0:

#import "@preview/polylux:0.3.1": *

#set rect(width: 100%, height: 100%)
#set page( paper: "presentation-16-9"
         , header: rect(fill: aqua)[header]
         , footer: rect(fill: aqua)[footer]
         )

#polylux-slide[a]
#pagebreak()
#polylux-slide[b]

Yields this output: