readOnly property now working in style sheet for QLineEdit

According to the documentation (https://doc.qt.io/qt-6/stylesheet-examples.html) one can style a QLineEdit that is set to readOnly by the following style sheet:

QLineEdit[readOnly="true"] { color: gray }

But this does not work while the following variant (also found on the examples page) works:

QLineEdit:read-only { color: gray }