Fix embeddable projectiles dissapearing (reopening) (#35153)

Content.Shared/Projectiles/EmbeddedContainerComponent.cs

@@ -0,0 +1,13 @@
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Projectiles;
+
+/// <summary>
+/// Stores a list of all stuck entities to release when this entity is deleted.
+/// </summary>
+[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
+public sealed partial class EmbeddedContainerComponent : Component
+{
+    [DataField, AutoNetworkedField]
+    public HashSet<EntityUid> EmbeddedObjects = new();
+}