HTML перестал работать для глобального уведомления

[IAmGav (Gavin Perch)]

Возможно, стоит прочитать это:

No HTML in global notice

Yes, we no longer allow the global notice site setting to contain HTML, only plain text. We chose to treat it as any other user input and sanitize it. As mentioned above, the workaround would be to use a banner topic instead.