Fix for issues with self loops

cypress/integration/rendering/flowchart-v2.spec.js

@@ -786,7 +786,7 @@ A ~~~ B
       `---
       title: Subgraph nodeSpacing and rankSpacing example
       config:
-        flowchart: 
+        flowchart:
           nodeSpacing: 250
           rankSpacing: 250
       ---
@@ -1052,5 +1052,23 @@ end
         }
       );
     });
+    it('Should render self-loops', () => {
+      imgSnapshotTest(
+        `flowchart
+          A --> A
+          subgraph B
+            B1 --> B1
+          end
+          subgraph C
+            subgraph C1
+              C2 --> C2
+            end
+          end
+        `,
+        {
+          flowchart: { subGraphTitleMargin: { top: 10, bottom: 5 } },
+        }
+      );
+    });
   });
 });