Stack does not respect footer margin, not sure if intended behavior or a bug.

[Flightkick]

The following snippet shows a quick demo:

#set page(
    paper: "a4", 
    numbering: "1", 
    footer: [
        #box(width: 100%, height: 100%, fill: rgb("#006C73"))
    ]
  )

#stack(dir: ttb,
  block(breakable: false, height: 90%, width: 120%, fill: rgb("#E4EDFF"))[a],
  block(breakable: false, height: 300pt, width: 120%, fill: rgb("#7EBCC9"))[b], // Doesn't respect footer margin, is truncated at end of page.
  block(breakable: false, height: 300pt, width: 120%, fill: rgb("#008C95"))[c], // Does respect header margin.
)

When using a stack, it doesn't seem to respect the page footer margin. It's content won't break to the next page unless significant v-space is applied before the overlapping content. I would expect box b to be rendered on the next page.

This is just an example but for my actual use-case I'm using a complex table build width grids inside stacks where I'm trying to keep grids together inside non-breakable blocks. This shows the same behavior, the table overlaps the footer and page numbering where I expect it to push the whole non-breakable block down to the next page.

Not sure if this is intended behavior or a bug.