Enclose in text {} breaks down all quiz

  • Hello!
    I use nginx+php-fpm.I recently updated update php from 5.6 to 7.3. And after I noticed that quiz with answer variant ‘Enclose in text {}’ – not starting. Button ‘start’ does not react, autostart – not work. When i delete this question – all work fine. Have any ideas?

    The page I need help with: [log in to see the link]

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