text()[not(ancestor::div[@class='e'])] is not working

[iLibra]

Please answer these questions before submitting your issue. Thanks!

1. What did you do（使用的表达式与使用场景，确保能够复现）?
   If possible, provide a recipe for reproducing the error.
   String test="<div class='a'> a <div>need</div> <div class='e'> not need</div> c </div>";

JXDocument j = JXDocument.create(test);
List<JXNode> l = j.selN("//div[@class='a']//text()[not(ancestor::div[@class='e'])]");
for (JXNode i : l){
System.out.println(i);
}
`

2. What did you expect to see（期望看到什么）?
   a need c

3. What did you see instead（JsoupXpath给出的结果）?
   a need no need c

4. What version of JsoupXpath are you using（当前版本）?
   2.3.2