QML RichText centering paragraph doesn't work on image

When an image is wrapped in a paragraph, and displayed in a RichText format Text object, centering doesn't work. Adding some text makes it work. For instance:

<p align="center">foo</p>

centers the word "foo", but

<p align="center"><img src="foo.png"></p>

doesn't center the image. However,

<p align="center">&nbsp;<img src="foo.png">&nbsp;</p>

adds enough text to center the image.

This may affect Qt widgets too, but I haven't tried it.