What steps will reproduce the problem?
1. Create placemark with id "1" 
      IKmlPlacemark p = ge.createPlacemark("1");
2. Add it to feature list
      ge.getFeatures().appendChild(p);
3. Remove it from the feature list
      ge.getFeatures().removeChild(p);
4. Create the placemark again
      p = ge.createPlacemark("1");

What is the expected output or behavior? What do you see instead?

I expect to be able to create the same placemark with the same id, since 
it was removed before, instead i get an HRESULT E_FAIL COM component 
exception. Which means that the placemark cannot be created since its id 
already exists


Which plugin version are you using?
5.0.11655.6079