How to reproduce it :

• select the "Support" page
• click on the button to tag the page
• the "main section" tag is already selected
• enter "page" into the text filter field
  > only tags that contains "page" into the label appears
• click on the "only checked tags" button
  > there is no tag corresponding
• delete the text filter
  > all tags appears whereas only checked tags should appears

It occurs in the assistant of creation of a page or from the ribbon's button