diff --git a/src/web-ui/src/tools/editor/components/MarkdownEditor.tsx b/src/web-ui/src/tools/editor/components/MarkdownEditor.tsx
index af36da6b9f..4b060c9c33 100644
--- a/src/web-ui/src/tools/editor/components/MarkdownEditor.tsx
+++ b/src/web-ui/src/tools/editor/components/MarkdownEditor.tsx
@@ -143,8 +143,10 @@ const MarkdownEditor: React.FC<MarkdownEditorProps> = ({
 
   const toNormalizedMarkdown = useCallback((raw: string) => {
     const nextEditability = analyzeMarkdownEditability(raw);
-    const nextContent =
-      nextEditability.mode === 'unsafe' ? raw : nextEditability.canonicalMarkdown;
+    // Use raw content instead of canonicalMarkdown to avoid doubling
+    // backslashes in LaTeX commands (e.g. \int → \\int), which breaks
+    // KaTeX rendering. The tiptap editor normalizes content internally.
+    const nextContent = raw;
     return { nextEditability, nextContent };
   }, []);
 
@@ -262,9 +264,9 @@ const MarkdownEditor: React.FC<MarkdownEditorProps> = ({
       }
     } else if (initialContent !== undefined) {
       const nextEditability = analyzeMarkdownEditability(initialContent);
-      const nextContent = nextEditability.mode === 'unsafe'
-        ? initialContent
-        : nextEditability.canonicalMarkdown;
+      // Use raw content instead of canonicalMarkdown to avoid doubling
+      // backslashes in LaTeX commands, which breaks KaTeX rendering.
+      const nextContent = initialContent;
 
       setEditability(nextEditability);
       setContent(nextContent);
diff --git a/src/web-ui/src/tools/editor/meditor/utils/tiptapMarkdown.test.ts b/src/web-ui/src/tools/editor/meditor/utils/tiptapMarkdown.test.ts
index 0b18a501ba..8c1aca8672 100644
--- a/src/web-ui/src/tools/editor/meditor/utils/tiptapMarkdown.test.ts
+++ b/src/web-ui/src/tools/editor/meditor/utils/tiptapMarkdown.test.ts
@@ -334,4 +334,18 @@ describe('tiptap markdown compatibility', () => {
     expect(analysis.containsRawHtmlBlocks).toBe(true);
     expect(doc.content?.[0]?.type).toBe('rawHtmlBlock');
   });
+
+  it('doubles backslashes in LaTeX math during canonical round-trip', () => {
+    const markdown = String.raw`$$\int_0^1 x^2 dx = \frac13$$`;
+    const analysis = analyzeMarkdownEditability(markdown);
+
+    // Root cause of #1952: escapeMarkdownPlainText doubles every backslash
+    // during canonical serialization, turning \int into \\int, \frac into
+    // \\frac, etc. KaTeX interprets \\ as a line break, so the math renders
+    // incorrectly. This is why MarkdownEditor uses raw content instead of
+    // canonicalMarkdown for display.
+    expect(analysis.canonicalMarkdown).toContain(String.raw`\\int`);
+    expect(analysis.canonicalMarkdown).toContain(String.raw`\\frac`);
+    expect(analysis.canonicalMarkdown).not.toBe(markdown);
+  });
 });