QPainter's drawText method can't paint unicode characters with code values above 65535

Steps to Reproduce

Run the Wiggle Example (https://doc.qt.io/qt-6/qtwidgets-widgets-wiggly-example.html ) and copy + paste some affected text into the QLineEdit:

• https://unicode-table.com/en/22489/
• https://unicode-table.com/en/1D11E/

(Fun fact: JIRA crashes if I include those characters directly in this description)

Outcome

The text renders correctly in the QLineEdit but not in the WigglyWidget.

Original Report

http://www.unicode.org/cgi-bin/GetUnihanData.pl?codepoint=22489
This Chinese character will be stored using surrogate pairs, QPainter's drawText method can't paint this character, and QTextEdit can't display this character too. In both test, I use a font named "SimSun".
The same character can be displayed by other programs in my computer.