recently @brianskold was, I think, working on a patch to update to spec change that says having an animation of transform...
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... acts as though it's set, even if it's none. I think that update would change the behavior here?
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The change we made only affects the creation on stacking contexts, not computed style
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It probably should affect the computed style that way, assuming that's what Chrome/Edge do. Maybe will-change too?

Oct 22, 2016 ยท 9:53 PM UTC

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The change was based on a spec change: if you have a delayed animation for prop x acts as if will-change:x was set
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Yes, and maybe will-change: transform should make computed transform be matrix() rather than none?
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