[css-flexbox][css-grid] Automatic minimum size on replaced element with `overflow` different than visible/clip

[Loirooriol]

https://software.hixie.ch/utilities/js/live-dom-viewer/saved/11339

<div style="display: flex; width: 50px;">
  <canvas width="1" height="1" style="background: blue; height: 100px; overflow: visible"></canvas>
</div>
<div style="display: flex; width: 50px;">
  <canvas width="1" height="1" style="background: cyan; height: 100px; overflow: scroll"></canvas>
</div>

There is interoperability that in the 1st case the automatic minimum size makes the flex item be 100px, and in the 2nd case the automatic minimum size is avoided due to overflow: scroll.

However, https://drafts.csswg.org/css-flexbox-1/#min-size-auto says "a flex item that is not a scroll container". And the <canvas> is replaced, so it's not really a scroll container?

Should the spec check the computed value of overflow-x/y instead of being a scroll container? Should browsers change?

[Loirooriol]

From #7714 (comment)

RES0LVED: in the flex spec, for auto min sizing, instead of saying scroll container, we read the computed overflow property value