Annotations not working in Okular (missing characters)

Yesterday, I upgraded to Fedora 34 from a F33 install. Today, while using Okular (KDE's PDF reader), I noticed that special characters (áéíóúç etc...) doesn't appear in annotations made within the PDF. For example, in the image below, I should be getting 'xxx áéíóú xxx' rather than 'xxx xxx'. What can be causing this problem? I don't recall it happening in F33.