Precautions for binding shortcut keys of QPushButton

In a daily development , You need to add a shortcut key operation for the button , Pressing a key on the designated keyboard is equivalent to clicking this button with the mouse , This is the function of shortcut keys
There is a phenomenon that when the order of adding shortcut keys is like this , Invalid shortcut key
First bind the shortcut keys , Then set the button text , Invalid

QKeySequence keyCut(Qt::Key_Return);
btnStart->setShortcut(keyCut);
btnStart->setText(" Start ");

Set the text first , Then bind the shortcut keys , It works

btnStart->setText(" Start ");
QKeySequence keyCut(Qt::Key_Return);
btnStart->setShortcut(keyCut);

Then I try again to comment out the code that sets the text , Then bind the shortcut key , Run the program , Press enter , I rely on , The program crashed

//btnStart->setText(" Start ");
QKeySequence keyCut(Qt::Key_Return);
btnStart->setShortcut(keyCut);

The above is a small detail I found in a daily development , I don't know if it's my version Qt5.7.1 Reasons for too low , At present, I haven't tried the higher version Qt Whether there is the same phenomenon , Welcome to leave a message for discussion !!