(Expanding on comment 5: the bug's not considered fixed until the patch merges to mozilla-central, since that's what Nightly is built from (and what ultimately merges to beta, etc). The phabricator "published" status just means that it landed on autoland (e.g. comment 4); but often a half-day or so can go by between merges from autoland to mozilla-central (or more, in rare cases where there's substantial bustange on autoland that needs cleaning up, or other infrastructure issues).
Bug 1899319 Comment 7 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Expanding on comment 5: the bug's not considered fixed until the patch merges to mozilla-central, since that's what Nightly is built from (and what ultimately merges to beta, etc). The phabricator "published" status just means that it landed on autoland (e.g. comment 4); but often a half-day or so can go by between merges from autoland to mozilla-central (or more, in rare cases where there's substantial bustange on autoland that needs cleaning up, or other infrastructure issues).