remove fdo group doesn't work

[david_hequetTMA4M]

I'm having a bug when i try to remove FDO group using .net API in Autocad MAP 2024.

Sample code i used:

 public static void addGroupTest()
 {
     Document doc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;
     using (DocumentLock docLock = doc.LockDocument())
     {
         AcMapMap currentMap = AcMapMap.GetCurrentMap();
         MgLayerGroupCollection groups = currentMap.GetLayerGroups();

             // create the layer group
             var lGroup = new AcMapLayerGroup("test");
             lGroup.SetDisplayInLegend(true);
             lGroup.SetVisible(true);
             lGroup.SetExpandInLegend(true);
             groups.Add(lGroup);
         
     }
 }

 public static void removeGroupTest()
 {
     Document doc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;
     using (DocumentLock docLock = doc.LockDocument())
     {
         AcMapMap currentMap = AcMapMap.GetCurrentMap();

         var group = currentMap.GetLayerGroups().Where(g => g.Name == "test").First();

         Debug.Print($"before removal {currentMap.GetLayerGroups().Count}");
         currentMap.GetLayerGroups().Remove(group);
         group.Dispose();
         Debug.Print($"after removal {currentMap.GetLayerGroups().Count}");
     }
 }

steps to reproduce:

• use addGroupTest: the group "test" is added to the map
• use removeGroupTest: the group "test" is removed from the map

Behavior encountered:

When i use removeGroupTest function, the group is removed from currentMap.GetLayersGroups() but still appear on the layer explorer.

If i try "addGroupTest" again, the code show me currentMap.GetLayersGroups() just one group, but i see two groups in layer explorer: "test" and "" (i presume Acad didn't want to add two groups with same name)

Here are several screenshots to illustrate:

Red, what i logged during removal (and surrended in red what i see in layer manager after 'removed")

Green, what i logged during add (after remove)

Layer manager after the second "add":