Sometimes, unexpected toast is shown when user tries to update locked component

Scenario for HAP:

1. Login as admin and login as editor in the separate windows.
2. As an admin go to the news page.
3. As an editor got to the news page.
4. As an editor click "add new document" orange button and stays with open side panel.
5. As an admin lock the news component by changing and saving the changes.
6. As an editor continue creating the document and press save.

Expected behavior: toast message is shown saying that the component cannot be updated.

Actual behavior: three toast messages are shown together with an unexpected one (see screenshot) 

 Another way to reproduce this is if you see comment https://issues.onehippo.com/browse/CMS-14112?focusedCommentId=589088&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-589088

Note that further click Save button results into another message: "Document is not yours to edit it" which is also wrong because the editor is the one who created the document.