QString assertion failure using UTF-16 character in QJsonObject key

In debug mode, I get an assertion failure when inserting valid data into a QJsonObject object.

The message error is
ASSERT: "lhs.size() == rhs.size()" in file C:\Users\qt\work\qt\qtbase\src\corelib\text\qstring.cpp. line 1395

This is reproducible with these 3 lines of code and only if UTF-16 character is used for the JSON object key and if the second key is prior to the first one in alphabetical order.

QJsonObject myObject;
myObject.insert("k♭", "First key"); // key should contain UTF-16 character
myObject.insert("a", "Second key");  // second key should be prior to first key in alphabetical order

I checked the code and usually the size of lhs and rhs is checked before calling the function QtPrivate::equalStrings(QStringView lhs, QStringView rhs) (for example in comparesEqual function in file qstring.h at line 799)

But this is not the case in function stringCompareElement(const QtCbor::Element &e, String s, QtCbor::Comparison mode) in file qcborvalue_p.h:365.