Html field not saved when saving quickly after open

This issue follows out of HSTTWO-568. I have now been able to reproduce it in a default quickstart-war cms:

• start quickstart-war
• log in
• click on "To the documents"
• click on folder "news"
• add new document of type "News" (new document is opened in editor)
• click in the field "Body", it has the word "body" as content
• type one character directly after the word "body", e.g. "body1"
• directly after typing the character in the Body field, click on "Save"
• CMS will show loading icon, then content of Body field is reverted to "body"

To get the Body field saved, you need to wait after you type in it, until you see the loading icon appear and disappear. Only then click Save, and the field will be saved properly.