Select All in context menu of QAbstractSpinBox does not show keyboard accelerator

Attached are two screenshots, one shows the context menu of a QLineEdit Widget which shows "Ctrl+A" in the last line with "Select All" ind then there is the context menu for QDateEdit (same for QTimeEdit and other subclasses of QAbstractSpinBox) without the keyboard shortcut "Ctrl+A"

I expect both menus to show up the same. I see no reason why "Ctrl+A" is shown for one Widget and not for some other.