After converting flowed-text to text, the top line of a multi-line text object will not observe line spacing when inserting a line-return. Proper spacing is displayed in the text-font panel, however.
Lines of text below the top line in flowed text allow insertion of line-returns that conform to line-spacing after conversion to text.
Workaround:
Copy and paste of converted text characters as a new text object resolves the spacing issue.
![Image](https://bugs.launchpad.net/inkscape/+bug/1676059/+attachment/4845730/+files/2017-03-25_11-18-31.gif)
https://bugs.launchpad.net/inkscape/+bug/1676059