Meander advanced question resulting in a misunderstanding bug

Questions
,
3

I prefer not to share the full code snippet because it’s important to me, but I investigated the issue and I think I found both the cause and a possible workaround.

My clue is that the issue happens when the box height becomes slightly larger than the page height. In that situation, the problem appears consistently.

I identified this by setting the container height to more than 100% :

#import "@preview/meander:0.4.2"
#let column(n-pages, last-page-height: 50%, placement: (), content) = {
  meander.reflow({
      // meander.opt.overflow.alert()
       meander.opt.debug.post-thread()

    for page in range(n-pages) {
      for p in placement {
        if p.page == page {
          p.obj
        }
      }
      if page != (n-pages - 1) {
        meander.container(
          width: 50% - 3mm,
          // here 
           height: 101%,
          margin: 6mm,
          //style: (text-fill: teal)
        )
        meander.container(
        // and here
          height: 101%,
          //style: (text-fill: purple)
        )
          meander.pagebreak()
          
      } else {
        meander.container(
          width: 50% - 3mm,
          margin: 6mm,
          height: last-page-height,
          //style: (text-fill: teal)
        )
        meander.container(
          height: last-page-height,
          //style: (text-fill: purple)
        )
      }
    }
    meander.content[
      #content
    ]
  })
}

My guess is that, for some reason, the computed height becomes slightly greater than 100% .

If the height is set exactly to 100% , the issue can still happen, possibly because of floating-point approximation. However, if I reduce it slightly (for example 99.99% ), the problem disappears.

I’ll try to create a minimal reproducible example for this issue.