Cannot unbold a bold word selected with double-click

Follow this steps to reproduce:

• edit a new page and write 3 words, like "alice bob carol"
• double click the middle one, "bob" in my case
• click the bold button on the tool bar
• click anywhere in the text to loose the selection
• double click again the middle word, which this time should be bolded.
• the bold toggle button on the tool bar should have been down; it isn't so I cannot unbold the middle word which I selected with double click.