After update to version 11 text in italic are also in bold now when published

Something strange happens when cursive text is being published. When I put text in cursive in WordPress, it automatically puts it into bold too when published. A good example can be found in our most recent article (https://unric.org/nl/jongeren-zetten-eerste-stappen-in-duurzaam-ondernemen/): the words ‘Futur Défi’ and ‘Défidée’ are meant to be only shown in cursive but are being published in bold as well. Same story for the photo captions. There is no issue when text is deliberately put in bold, as with the subtitles.