When `UpdateService` observes `"post-update-processing"` topic, it will add an observer for `"sessionstore-windows-restored"` topic instead of calling `_postUpdateProcessing` directly (See [here](https://searchfox.org/mozilla-central/rev/6b1e306175c2284958fb185bab388021e2890ed0/toolkit/mozapps/update/UpdateService.sys.mjs#2719-2727)). So if the session store module fails to notify `"sessionstore-windows-restored"` topic for some reason, `_postUpdateProcessing` will not be called. Does it explain what is going on?
Bug 1875502 Comment 17 Edit History
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When `UpdateService` observes `"post-update-processing"` topic, it will add an observer for `"sessionstore-windows-restored"` topic instead of calling `_postUpdateProcessing` directly (See [here](https://searchfox.org/mozilla-central/rev/6b1e306175c2284958fb185bab388021e2890ed0/toolkit/mozapps/update/UpdateService.sys.mjs#2719-2727)). So if the session store module fails to notify of `"sessionstore-windows-restored"` topic for some reason, `_postUpdateProcessing` will not be called. Does it explain what is going on?