Observed:
In the mission editor, individual placed units will automatically group if placed close to each other, and any individual unit can be grouped to another by selecting group mode and dragging a link between them.
When the user places an autonomous static weapon, this functionality gets broken until the user exits, then re-enters the mission editor. (the user can still modify group links of any unit that has a group link, but can not modify group links of any newly placed units).
Expected:
Placing any unit type should not break the editor. Even if autonomous static weapons are unable to be grouped, this should not affect grouping other units.