utils.fit-to-height no longer working on typst 0.12

[PhotonQuantum]

utils.fit-to-height produces a blank area with no content on typst 0.12. The layout is calculated correctly, though.

I bisected Typst, and it seems that it's this PR typst/typst#4212 that introduced the bug.

In the PR description it says,

The exact semantics of how tags will stick to elements are also still somewhat in-flux and will likely a change a bit in later refactor phases. These rules affect the results of .page() and .position() calls on locations. With this PR, things should mostly be the same as on main, though there will be edge cases where things changed a bit. They might change again with further refactoring.

There are other libraries affected by this change (typst/typst#4302).

POC

#import "@preview/touying:0.5.3": *
#import themes.simple: *

#show: simple-theme.with(aspect-ratio: "16-9")

= Title

== First Slide

#utils.fit-to-height(0.5fr)[
  #lorem(50)
]

#lorem(50)

Expected

Got