Blank closing tags

I have a post with a long unorderd list and When I put the <!–more–> tag in WordPress inserts a blank closing tag.
I have —

• Blah

<!--more-->

• Blah

Wordpress converts this to —

• Blah

<!--more--></>

• Blah

I guess the symantic processor is looking to close the <!–more–> tag. I also noticed this problem it I have more in the middle of a . If this is the case there needs to be some exception to the close tag that allows.
Also when a summary of the article is created the block is not closed so the summary reads —

• Blah

(More...)

Any suggestions other than rewriting the entry I guess this is causing a number of pages to fail validation