How can I cancel the updates of a Confluence page

When I open a page in update mode, I click on Enter, I cancel it with ctrl+Z and then I click on Close, to not update the page. A popin says it's possible my updates are lost, then I accept it.

Then there is a message/link saying I have updates not saved. (on the left of the button Update) When I click, it opens the page in Update mode. I have the impression the only way to make the message disappear is to save the page. So I save the page and when I check history of modifications, There is my saving but no difference :/ 

This is a normal behaviour ? How to do to not "update nothing" in the history ?