Starting page redundancy check fails in the presence of some heading show rules

[tingerrr]

Given a show rule which introduces an "invisible" element such as v(...) before the heading, the margin redundancy check fails, causing hydra to display the last heading on a page which starts with a new heading.

#import "@preview/hydra:0.4.0": hydra

#set page(header: context hydra(1))
#set heading(numbering: "1.1")

#show heading.where(level: 1) : it => pagebreak(weak: true) + {
  // uncommenting this or adding a block around this whole rule fixes the issue
  // metadata(())
  v(1em)
  it
}

= First
#lorem(10)

= Second
#lorem(10)

#pagebreak()
#lorem(10)

To work around this, consider surrounding your headings with a container, i.e. a block or box, avoid using metadata as it is likely not intended to cause the location collapse, see the upstream issue.

Upstream issue: typst#4029.
Supersedes #2.