I got a JS error on MediaWiki.org when opening my Notices:
```
18:05:50.724 TypeError: newNotifData.bundledNotifications.map is not a function
mw.echo.Controller.prototype.fetchLocalNotifications/<() load.php:6
.Deferred/promise.then/</</<() load.php:47
jQuery.Callbacks/fire() load.php:45
jQuery.Callbacks/self.fireWith() load.php:46
.Deferred/promise.then/</</<() load.php:47
jQuery.Callbacks/fire() load.php:45
jQuery.Callbacks/self.fireWith() load.php:46
.Deferred/</deferred[tuple[0]]() load.php:47
mw.echo.api.PromisePrioritizer.prototype.setSuccess/<() load.php:37
jQuery.Callbacks/fire() load.php:45
jQuery.Callbacks/self.fireWith() load.php:46
.Deferred/</deferred[tuple[0]]() load.php:47
mw.Api.prototype.ajax/xhr<() load.php:112
jQuery.Callbacks/fire() load.php:45
jQuery.Callbacks/self.fireWith() load.php:46
done() load.php:135
.send/callback() load.php:141
1 load.php:6:648
```
Weirdly, it worked when I retried in debug mode, and then after that.