A fix has been implemented by our partner and they are monitoring the result.
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One of our partner (Pusher) is currently having an issue.
This could prevent our admin interface to show a notification for actions such as: create a new field, update a field, destroy a field, forking an enviroment, duplicating a site, uploading a new upload and so on.
Please, refresh your browser page as the underneath operation might have been completed successfully even if no notification is shown.