Perhaps in some cases this is a sign that the WAS is struggling/torn/can't face it/on the bring of coming home/etc...
But, in most cases, I really think they can't be bothered if it is not something that will help them in some clear way. A WAS is very nearly completely emotionally D. The M isn't guiding their choices in any way. It is over. The legal D is a pain in the butt that really isn't just much of a priority for them because they are not all-about-the-M anymore at all. It just isn't much on their radar.