Steps to reproduce:

1. Edit a confluence page.
2. Add a (1x1) table.
3. Edit the table cell, enter: "foo<shift><cr>bar", that is "foo" then press <shift> and <cr> for a (non-paragraph) line break and the enter "bar".
4. Add another (1x1) table.
5. Select the previously entered multiline "foo bar" string.
6. Press <ctrl>+<c> or select "copy" from the right click context menu of the selected string.
7. Click on the second (new and empty) table.
8. Press <ctrl>+<v> or select "paste" from the right click context menu of the empty table cell.

Observe that the copy uses a paragraph break, and the original only a line break. That is the copied text contains a bigger vertical space between "foo" and "bar".