It was fixed partially, it was not fixed correctly.
When you bookmark a site (in a private tab), whose favicon you have in the browser cache:
The new bookmark would have the most old favicon (favicon of the first bookmark entry for this site (domain)).
It should take favicon from the last created entry for this domain, not the first one.
The left bookmarks were created in incognito tabs, and they have the most old favicon that was available in the browser cache.
(And this is cool that the browser stores the old favicon, just use the most recent for new created bookmarks)
When you bookmark the site, whose favicon you have not in the cache:
The bookmarks has no favicon at all.