Completions shortcut keys and menu commands don't work (Edit | Completions | ...)

First enable Word Auto-Completion in Options [F12] by enabling “Suggest completions as you type” and probably disabling “In script mode only”

In Project Settings [Project | Project Settings …], you can manually add and delete words and phrases to included in your auto-complete list. This works fine.

When you then start to type, any words in this list matching the first characters you type will appear and you can toggle up and down using the arrow keys and press enter to accept and the word /phrase is pasted. This words fine.

The menu commands [Edit | Completions] do NOT appear to work.
The keyboard shortcuts to add and complete entries do NOT appear to work either.