`rect-around()` does not fit group after rotating

[bendix4620]

rect-around() features unexpected behavior when used on a group after a rotation

#import "@preview/cetz:0.4.2"
#set page(height: auto, width: auto, margin: 5pt)
#cetz.canvas({
  import cetz.draw: *
  rotate(30deg)
  group(name: "foo", {
    circle((0, 0))
    circle((2, 0))
  })
  rect-around("foo")
})

what I got	what I expected

tested with cetz 0.4.2, typst 0.14.2

[bendix4620]

Some more testing in hope of uncovering something useful:

Manually using the corners of the AABB surrounding the untransformed circles works flawlessly (that's how I generated the right image)

#import "@preview/cetz:0.4.2"
#set page(height: auto, width: auto, margin: 5pt)
#cetz.canvas({
  import cetz.draw: *
  rotate(30deg)
  group(name: "foo", {
    circle((0, 0))
    circle((2, 0))
  })
  rect-around((-1, -1), (3, 1))
})

However, rect-around() draws a rectangle around the group anchors (shown in red) and not the group's children. The group anchors are rotation invariant though and I begin to wonder, should they?

source code

#import "@preview/cetz:0.4.2"
#set page(height: auto, width: auto, margin: 5pt)
#cetz.canvas({
  import cetz.draw: *
  rotate(30deg)
  group(name: "foo", {
    circle((0, 0))
    circle((2, 0))
  })
  rect-around("foo")
  for-each-anchor("foo", name => {
    circle("foo." + name, fill: red, stroke: none, radius: 0.05)
  })
})

or more complicated the way rect-around() discoveres anchors:

#import "@preview/cetz:0.4.2"
#set page(height: auto, width: auto, margin: 5pt)
#cetz.canvas({
  import cetz.draw: *
  rotate(30deg)
  group(name: "foo", {
    circle((0, 0))
    circle((2, 0))
  })
  rect-around("foo")

  get-ctx((ctx) => {
    let pts = ("foo", )
    // point discovery from rect-around() function
    let more_points = ()
    for pt in pts {
      // If objects are given (by string name), include all anchors
      if type(pt) == str and pt in ctx.nodes {
        for anchor in (ctx.nodes.at(pt).anchors)(()) {
          let temp = pt + "." + anchor
          more_points.push(temp)
        }
      } else {
        more_points.push(pt)
      }
    }

    for p in more_points {
      circle(p, fill: red, radius: 0.05, stroke: none)
    }
  })
})