How to reproduce:

• In the content of an article,
  • put some titles (at any level)
  • apply bold style to some of them
• In the page containing the article, clcik on the PDF Export button (on the top right in the demo display)
  • the PDF exported does not contain the bold titles => KO
  • It does contain the other ones => OK

Note that this behaviour may be the same with italic but not bold

Orginal text:

Si dans un texte riche on a du texte mis en forme en "gras + titre 1", ce texte n'est pas exporté dans le pdf