Input fields (QWidgets and QML) don't register dead keys accents when using a Linux desktop

Input "accent" characters using Linux desktop doesn't work in a Qt for webassembly page.

In Windows they work well, something like "é" works just fine, but in Linux they don't work, it will just display "e".

This in a QLineEdit (QtWidgets) and TextField (QML).

In a portuguese keyboard "é" is inputted with '´' followed by 'e'.