This is pretty closely related to T59373, but it came up because there's a campaign titled "Steward elections & confirmations 2020". I recommend fixing this more generally, rather than adding one character at a time to the list.
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I guess the fix is really the fixme at https://github.com/wikimedia/mediawiki-extensions-CentralNotice/blob/5c1f081/includes/api/ApiCentralNoticeQueryCampaign.php#L8 - Is there a task for doing that?