diff --git a/packages/lexical-markdown/src/__tests__/unit/LexicalMarkdown.test.ts b/packages/lexical-markdown/src/__tests__/unit/LexicalMarkdown.test.ts
index e5eb74bda..3c930fd6c 100644
--- a/packages/lexical-markdown/src/__tests__/unit/LexicalMarkdown.test.ts
+++ b/packages/lexical-markdown/src/__tests__/unit/LexicalMarkdown.test.ts
@@ -186,6 +186,15 @@ describe('Markdown', () => {
       html: '<pre spellcheck="false"><span style="white-space: pre-wrap;">Code</span></pre>',
       md: '```\nCode\n```',
     },
+    {
+      html: '<pre spellcheck="false" data-highlight-language="javascript"><span style="white-space: pre-wrap;">Code</span></pre>',
+      md: '```javascript\nCode\n```',
+    },
+    {
+      // Should always preserve language in md but keep data-highlight-language only for supported languages
+      html: '<pre spellcheck="false"><span style="white-space: pre-wrap;">Code</span></pre>',
+      md: '```rust\nCode\n```',
+    },
     {
       // Import only: prefix tabs will be removed for export
       html: '<pre spellcheck="false"><span style="white-space: pre-wrap;">Code</span></pre>',