diff --git a/Scenes/ColumnModels.gd b/Scenes/ColumnModels.gd
index d7270593..b380a0f3 100644
--- a/Scenes/ColumnModels.gd
+++ b/Scenes/ColumnModels.gd
@@ -161,8 +161,6 @@ extends Node
 
 	#print(columnModels[idx])
 	
-	#oDataClm.update_all_utilized()
-	
 	#CODETIME_START = OS.get_ticks_msec()
 	
 #	var mmInstance = MultiMeshInstance.new()
diff --git a/Scenes/SlabColumnEditor.gd b/Scenes/SlabColumnEditor.gd
index c2b62882..cd3096d5 100644
--- a/Scenes/SlabColumnEditor.gd
+++ b/Scenes/SlabColumnEditor.gd
@@ -16,7 +16,6 @@ func _on_ColumnEditor_visibility_changed():
 	if is_instance_valid(oDataClm) == false: return
 	
 	if visible == true:
-		oDataClm.update_all_utilized() # Run this before _on_ColumnEditorTabs_tab_changed()
 		oColumnEditorVoxelView.initialize()
 		oPropertiesTabs.set_current_tab(2)
 		
diff --git a/Scenes/SlabPlacement.gd b/Scenes/SlabPlacement.gd
index 7ed9186d..56d22f7c 100644
--- a/Scenes/SlabPlacement.gd
+++ b/Scenes/SlabPlacement.gd
@@ -102,7 +102,8 @@ func mirror_placement(shapePositionArray, mirrorWhat):
 				MIRROR_STYLE:
 					pass
 				MIRROR_ONLY_OWNERSHIP:
-					calculateOwner = true
+					if slabID_is_ownable(slabID):
+						calculateOwner = true
 			
 			if calculateOwner == true:
 				if oMirrorOptions.ui_quadrants_have_owner(mainPaint) == false: