This has never happened to me but this is more a "menu" issue than an application one.

As a starting point I suggest you navigate to the file 

~/.config/menus/gnome-application.menu


See if its listed there and if there are any issues with the listing.

There is also an app called "menulibre" which allows you to add/modify icon names. It available in the AUR.

IPython Qt Console doesn't have a title in GNOME app switcher
In which context do you use the stressed bʌt and when do you use the unstressed bət? How often is that?
If you know about the website www.forvo.com, I think it's a shortcoming that speakers use only one of the two versions. 
