Problems after dragging an annotation between groups in the Annotations Editor

Scenario:

1. Open Sequence View for "murine.gb".
   Expected result: there is "CDS" annotations group in the Annotations Editor. It is shown "(0, 4)" nearby the group name (i.e. there are 0 subgroups, 4 annotations).
2. Select sequence region: "1000..2000".
3. Open "Create Annotation" dialog.
   Expected result: there are fields "Group name" and "Annotation name" in the dialog.
4. Input "GROUP" to the "Group name" field.
5. Input "ANNOT" to the "Annotation name" field.
6. Close "Edit Annotations" dialog, applying the changes.
   Expected result: there is "GROUP" group in the Annotations Editor. It is shown "(0, 1)" nearby the group name. There is one "ANNOT" annotation under the group.
7. Drag "ANNOT" annotation to the "CDS" group using the mouse.
   Current result:
   • It is written "(0, 5)" near the "CDS" group in the Annotations Editor.
   • There is "ANNOT" annotation under the "CDS" group.
   • It is written "(0, 1)" near the "GROUP" group in the Annotations Editor.
   • There are two "ANNOT" annotations in the Zoom View.

Probably, there should be one "ANNOT" annotation in the "CDS" group and zero annotations in the "GROUP" group in the Annotations Editor. And there should be only one annotation in the Zoom View. However, there will be problems on saving the document: the empty groups are not kept after document reloading.