Fix body bags not taking humans (#6125)

Content.Server/Foldable/FoldableSystem.cs

@@ -48,9 +48,13 @@ namespace Content.Server.Foldable
             if (TryComp(uid, out StrapComponent? strap) && strap.BuckledEntities.Any())
                 return false;
 
-            // Also check if this entity is "open" (e.g., body bags)
-            return !TryComp(uid, out EntityStorageComponent? storage) || !storage.Open;
+            if (!TryComp(uid, out EntityStorageComponent? storage))
+                return true;
 
+            if (storage.Open)
+                return false;
+
+            return !storage.Contents.ContainedEntities.Any();
         }
 
         /// <summary>

Content.Server/Storage/Components/EntityStorageComponent.cs

@@ -8,6 +8,7 @@ using Content.Server.Ghost.Components;
 using Content.Server.Tools;
 using Content.Shared.Acts;
 using Content.Shared.Body.Components;
+using Content.Shared.Foldable;
 using Content.Shared.Interaction;
 using Content.Shared.Item;
 using Content.Shared.Physics;
@@ -233,11 +234,13 @@ namespace Content.Server.Storage.Components
                     continue;
 
                 // conditions are complicated because of pizzabox-related issues, so follow this guide
+                // 0. Accomplish your goals at all costs.
                 // 1. AddToContents can block anything
                 // 2. maximum item count can block anything
                 // 3. ghosts can NEVER be eaten
                 // 4. items can always be eaten unless a previous law prevents it
                 // 5. if this is NOT AN ITEM, then mobs can always be eaten unless unless a previous law prevents it
+                // 6. if this is an item, then mobs must only be eaten if some other component prevents pick-up interactions while a mob is inside (e.g. foldable)
 
                 // Let's not insert admin ghosts, yeah? This is really a a hack and should be replaced by attempt events
                 if (_entMan.HasComponent<GhostComponent>(entity))
@@ -259,8 +262,16 @@ namespace Content.Server.Storage.Components
                 // Seriously, it is insanely hacky and weird to get someone out of a backpack once they end up in there.
                 // And to be clear, they should NOT be in there.
                 // For the record, what you need to do is empty the backpack onto a PlacableSurface (table, rack)
-                if (targetIsMob && !storageIsItem)
-                    allowedToEat = true;
+                if (targetIsMob)
+                {
+                    if (!storageIsItem)
+                        allowedToEat = true;
+                    else
+                    {
+                        // make an exception if this is a foldable-item that is currently un-folded (e.g., body bags).
+                        allowedToEat = _entMan.TryGetComponent(Owner, out FoldableComponent? foldable) && !foldable.IsFolded;
+                    }
+                }
 
                 if (!allowedToEat)
                     continue;