Incomplete shortcuts display in menu items

The menu items do not show the right shortcut with all the modifiers (⌘ N, ⌘ O, and ⌘ S in the example), but just the last character: see the attached screenshot.

In the code, generated with pyside6-uic form the qtdesigner interface the menu item was registered with:

self.action_open.setText(QCoreApplication.translate("MainWindow", u"&Open", None))
self.action_open.setShortcut(QCoreApplication.translate("MainWindow", u"Ctrl+O", None))

 
I also tried with a MWE (unfortunately thrown away, but I can reconstruct it if needed) creating the menu items directly from the code (i.e., without the uic translation) but the result is the same. The same happens also if I switch from PySide6 to PyQt6.

if it can be helpful, when I click on the menubar for opening the File menu the following SVG error is reported in the log (with CORESVG_VERBOSE=1).

Unhandled operator '.'
Unhandled operator '1'
Unhandled operator '7'
Unhandled operator '9'
...
C/c command was given the wrong number of points.