Let's take the following example:

• Editor open an edit (edit 1) to change title of Recording R to <title1>: http://test.musicbrainz.org/edit/14460079
• Then this editor realizes that he made a mistake, and open a new edit without canceling the first one: http://test.musicbrainz.org/edit/14460080

Second edit receives 3 votes and got applied, while first edit receives no votes on expiration.
The following changes happen:
<original title> – (2nd edit) --> <title2>
then <title2> – (1st edit) --> <title1>

This is an unexpected behavior, 1st edit should fail because title has already been changed.

I guess this apply to more edit types and entity properties than just Edit Recording and Recording title.