Style applied to a list item content is not saved correctly

• XWiki Enterprise 1.8.1 with color plugin activated in the WYSIWYG editor + FF3
• Write Item 1, hit enter, Item 2, hit enter, Item 3
• Select the 3 lines and turn them into a list
• Select the second list item and set its background color to red
• Save the page

The generated syntax is:

* Item 1
* (% style="background-color:rgb(255, 0, 0);" %) Item 2
(%%) * Item 3

-> the third line isn't rendered as a list item.