@@ -34,14 +34,15 @@ export const frontmatterLiquidSyntax = {
         if (!isLiquidError(error)) throw error
         const { errorDescription, columnNumber } = getErrorMessageInfo((error as Error).message)
         const lineNumber = params.lines.findIndex((line) => line.trim().startsWith(`${key}:`)) + 1
+        const line = params.lines[lineNumber - 1]
         // Offset for the key, colon, space, and 1-based column; missing spaces throw YAMLException.
         const startRange = columnNumber + key.length + 3
-        // Clamp the range to the line length when Liquid reports past the end.
-        const endRange =
-          startRange + value.length - 1 > params.lines[lineNumber - 1].length
-            ? params.lines[lineNumber - 1].length - startRange + 1
-            : value.length
-        const range: [number, number] = [startRange, endRange]
+        // Block and multiline values continue on later lines, so the column does not map to the key line.
+        const isBlockScalar = /^[|>]/.test(line.slice(line.indexOf(':') + 1).trim())
+        const range: [number, number] | null =
+          !isBlockScalar && startRange <= line.length
+            ? [startRange, Math.min(value.length, line.length - startRange + 1)]
+            : null
         addError(
           onError,
           lineNumber,
 
@@ -23,6 +23,19 @@ describe(frontmatterLiquidSyntax.names.join(' - '), () => {
     expect(errors.map((error) => error.lineNumber)).toEqual([2, 3, 4, 5])
     expect(errors[0].errorRange).toEqual([9, 40])
   })
+  test.each([
+    ['intro: >-', '  Learn how {% dta variables.product.prodname_copilot %} works.'],
+    ['intro: |', '  {% data variables.foo }'],
+    ['intro: >-', '  {% data variables.foo }'],
+  ])('Block scalar "%s" with "%s" reports on the key line', async (keyLine, valueLine) => {
+    const markdown = ['---', 'title: Title', keyLine, valueLine, '---'].join('\n')
+    const result = await runRule(frontmatterLiquidSyntax, { strings: { markdown }, ...fmOptions })
+    const errors = result.markdown
+    expect(errors.length).toBe(1)
+    expect(errors[0].lineNumber).toBe(3)
+    expect(errors[0].errorDetail).toContain('Liquid syntax error')
+    expect(errors[0].errorRange).toBeNull()
+  })
   test('Liquid error message that contains a comma reports the full description', async () => {
     const markdown = ['---', 'title: "{% data foo }, and more"', '---'].join('\n')
     const result = await runRule(frontmatterLiquidSyntax, { strings: { markdown }, ...fmOptions })