I've found the document.
Here are some suggested updates:
For launchers:
App launchers MUST have a unique[3] 128×128 launcher icon with an alpha channel and a matching High Contrast icon.
I suggest changing this to say:
App launchers MUST have unique[3] 128×128 launcher icons in both the default High Contrast themes. For the default theme, the icon should be full-color with an alpha channel. For High Contrast, the icon should be black-and-white or grayscale.
I also suggest that we add the following to the "For applications" section:
Apps SHOULD include the icons used by their launcher.[*]
Apps SHOULD include a symbolic variant of their icon.
with a footnote that says:
[*] Relying on standard theme icons is likely to cause clashes where multiple applications use the same icon.
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