Zero Width Joiner is removed in Labels and TextFields

Hi there,

My Vaadin web application is translated to Nepali and we have a problem: the special characters ZWJ and ZWNJ are removed by Vaadin. It only happens in Labels and TextFields, not in MenuItems.

The characters are:
ZWNJ (zero width non joiner): U+8204 or &#200C;
ZWJ (zero width joiner): U+8205 or &#200D;

In the attachment you can see them in action. The top one is a menu item where the characters are displayed correctly (they control the combinations of two letters).
The middle one is a label where the characters get removed (they appear as 200C and 200D).
The bottom one is a text field where the characters get even worse.

This is the test code (I hope the characters work in this very text area):

String textWithZwnj = "छुट्‌याउनेछन्  क्ष  क्‌ष  क्‍ष";
        
        MenuBar menubar = new MenuBar();
        l.addComponent(menubar);
        MenuItem item = menubar.addItem(textWithZwnj, null);
        
        Label label = new Label(textWithZwnj);
        l.addComponent(label);
        
        TextField f = new TextField("Textfield", textWithZwnj);
        l.addComponent(f);

   Is there a setting to change this behaviour or is it a Vaadin bug?