Fix chairs not unbuckling entities when deconstructed or destroyed (#3696)

Content.Server/Construction/Completions/DestroyEntity.cs

@@ -0,0 +1,23 @@
+#nullable enable
+using Content.Server.GameObjects.EntitySystems;
+using Content.Shared.Construction;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+using System.Threading.Tasks;
+
+namespace Content.Server.Construction.Completions
+{
+    [UsedImplicitly]
+    [DataDefinition]
+    public class DestroyEntity : IGraphAction
+    {
+        public async Task PerformAction(IEntity entity, IEntity? user)
+        {
+            if (entity.Deleted) return;
+
+            var destructibleSystem = EntitySystem.Get<DestructibleSystem>();
+            destructibleSystem.ActSystem.HandleDestruction(entity);
+        }
+    }
+}