I don't know for sure how the Arc menu works, but I'm guessing it
creates entries with an icon referring to the Icon entry in the desktop
file for the snap, which for chromium (and all snaps) contains the
versioned revision:
$ grep Icon
** Attachment added: "Sample of what heppened"
https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1854613/+attachment/5309043/+files/snap.jpg
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