At lot of the times when content is pasted into the rich text editor from an outside source, nothing happens when the "Publish" button (nor the Save button) is clicked. In the console, the following message appears:
`Failed to set the 'innerHTML' property on 'Element': The provided markup is invalid XML, and therefore cannot be inserted into an XML document.`
I have not isolated specifically what type of formatting the pasted content needs to have in order not to work, but I belive that a text containing links is among the culprits.
The first step here should be to produce a meaningful error message when/if a content item can not be published due to formatting limitations of the Rich text editor. The second should be to improve support for pasted content in general