Program: 97599
Project: 97599
Buggy source:
public void load() throws OseeCoreException {
  Artifact aiArt=getArtifact();
  if (aiArt != null) {
    IAtsActionableItem aia=ActionableItemFactory.getOrCreate(aiArt.getGuid(),aiArt.getName());
    aia.setHumanReadableId(aiArt.getHumanReadableId());
    aia.setName(aiArt.getName());
    atsObject=aia;
    aia.setActive(aiArt.getSoleAttributeValue(AtsAttributeTypes.Active,true));
    aia.setActionable(aiArt.getSoleAttributeValue(AtsAttributeTypes.Actionable,true));
    aia.setDescription(aiArt.getSoleAttributeValue(AtsAttributeTypes.Description,"String_Node_Str"));
    Collection<Artifact> teamDefArts=aiArt.getRelatedArtifacts(AtsRelationTypes.TeamActionableItem_Team);
    if (!teamDefArts.isEmpty()) {
      Artifact teamDefArt=teamDefArts.iterator().next();
      IAtsTeamDefinition teamDef=TeamDefinitionFactory.getOrCreate(teamDefArt.getGuid(),teamDefArt.getName());
      aia.setTeamDefinition(teamDef);
      if (!teamDef.getActionableItems().contains(aia)) {
        teamDef.getActionableItems().add(aia);
      }
    }
    for (    String staticId : aiArt.getAttributesToStringList(CoreAttributeTypes.StaticId)) {
      aia.getStaticIds().add(staticId);
    }
    Artifact parentAiArt=aiArt.getParent();
    if (parentAiArt != null && parentAiArt.isOfType(AtsArtifactTypes.ActionableItem)) {
      IAtsActionableItem parentAi=ActionableItemFactory.getOrCreate(parentAiArt.getGuid(),parentAiArt.getName());
      aia.setParentActionableItem(parentAi);
      parentAi.getChildrenActionableItems().add(aia);
    }
    for (    Artifact userArt : aiArt.getRelatedArtifacts(AtsRelationTypes.SubscribedUser_User)) {
      IAtsUser user=AtsUsersClient.getUserFromOseeUser((User)userArt);
      aia.getSubscribed().add(user);
    }
    for (    Artifact userArt : aiArt.getRelatedArtifacts(AtsRelationTypes.ActionableItemLead_Lead)) {
      IAtsUser user=AtsUsersClient.getUserFromOseeUser((User)userArt);
      aia.getLeads().add(user);
    }
    for (    Artifact childAiArt : aiArt.getChildren()) {
      if (childAiArt.isOfType(AtsArtifactTypes.ActionableItem)) {
        IAtsActionableItem childAi=ActionableItemFactory.getOrCreate(childAiArt.getGuid(),childAiArt.getName());
        aia.getChildrenActionableItems().add(childAi);
        childAi.setParentActionableItem(aia);
      }
    }
  }
}

Fixed version (ground truth):
public void load() throws OseeCoreException {
  Artifact aiArt=getArtifact();
  if (aiArt != null) {
    IAtsActionableItem aia=ActionableItemFactory.getOrCreate(aiArt.getGuid(),aiArt.getName());
    aia.setHumanReadableId(aiArt.getHumanReadableId());
    aia.setName(aiArt.getName());
    atsObject=aia;
    aia.setActive(aiArt.getSoleAttributeValue(AtsAttributeTypes.Active,false));
    aia.setActionable(aiArt.getSoleAttributeValue(AtsAttributeTypes.Actionable,false));
    aia.setDescription(aiArt.getSoleAttributeValue(AtsAttributeTypes.Description,"String_Node_Str"));
    Collection<Artifact> teamDefArts=aiArt.getRelatedArtifacts(AtsRelationTypes.TeamActionableItem_Team);
    if (!teamDefArts.isEmpty()) {
      Artifact teamDefArt=teamDefArts.iterator().next();
      IAtsTeamDefinition teamDef=TeamDefinitionFactory.getOrCreate(teamDefArt.getGuid(),teamDefArt.getName());
      aia.setTeamDefinition(teamDef);
      if (!teamDef.getActionableItems().contains(aia)) {
        teamDef.getActionableItems().add(aia);
      }
    }
    for (    String staticId : aiArt.getAttributesToStringList(CoreAttributeTypes.StaticId)) {
      aia.getStaticIds().add(staticId);
    }
    Artifact parentAiArt=aiArt.getParent();
    if (parentAiArt != null && parentAiArt.isOfType(AtsArtifactTypes.ActionableItem)) {
      IAtsActionableItem parentAi=ActionableItemFactory.getOrCreate(parentAiArt.getGuid(),parentAiArt.getName());
      aia.setParentActionableItem(parentAi);
      parentAi.getChildrenActionableItems().add(aia);
    }
    for (    Artifact userArt : aiArt.getRelatedArtifacts(AtsRelationTypes.SubscribedUser_User)) {
      IAtsUser user=AtsUsersClient.getUserFromOseeUser((User)userArt);
      aia.getSubscribed().add(user);
    }
    for (    Artifact userArt : aiArt.getRelatedArtifacts(AtsRelationTypes.ActionableItemLead_Lead)) {
      IAtsUser user=AtsUsersClient.getUserFromOseeUser((User)userArt);
      aia.getLeads().add(user);
    }
    for (    Artifact childAiArt : aiArt.getChildren()) {
      if (childAiArt.isOfType(AtsArtifactTypes.ActionableItem)) {
        IAtsActionableItem childAi=ActionableItemFactory.getOrCreate(childAiArt.getGuid(),childAiArt.getName());
        aia.getChildrenActionableItems().add(childAi);
        childAi.setParentActionableItem(aia);
      }
    }
  }
}