test: Add E2E test for unsupported markdown

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

@@ -1164,4 +1164,20 @@ end
       `
     );
   });
+
+  it('should render raw strings for unsuported markdown', () => {
+    imgSnapshotTest(
+      `flowchart TB
+    mermaid{"What is\nyourmermaid version?"} --> v10["<11"] --"\`<**1**1\`"--> fine["No bug"]
+    mermaid --> v11[">= v11"] -- ">= v11" --> broken["Affected by https://github.com/mermaid-js/mermaid/issues/5824"]
+    subgraph subgraph1["\`How to fix **fix**\`"]
+        broken --> B["B"]
+    end
+    githost["Github, Gitlab, BitBucket, etc."]
+    githost2["\`Github, Gitlab, BitBucket, etc.\`"]
+    a["1."]
+    b["- x"]
+      `
+    );
+  });
 });