On macOS, if you use QKeyPressEvent, you will get "Num↑" etc. if you press an arrow key, using:

QString keyName = QKeySequence(keyEvent->key() | keyEvent->modifiers()).toString(QKeySequence::NativeText);
qDebug() << keyName; // Prints "Num↑", "Num↓", "Num←", "Num→" for the arrow keys

But if you reverse this and try to get QKeySequence using the string, you'll always get Qt::Key_unknown for all 4 arrow keys ("Num↑", "Num↓", "Num←", "Num→").

const QKeySequence seq(keyName);
if (seq.count() >= 1)
    qDebug() << seq[0]; // prints 3355443 which is Qt::Key_unknown, for "Num↑", "Num↓", "Num←", "Num→"

I would expect different numbers for the 4 keyNames.
The keyEvent::key() for the arrow keys returns Qt::Key_Left, Qt::Key_Right, Qt::Key_Up and Qt::Key_Down.

Since we are using non-commercial versions of Qt, please let me know if this was fixed in Qt 6.