@@ -83,12 +83,10 @@ const blockquoteRegexp = /^\n?([ \t]*>[ \t]?)/
 function handleBlockquote(tagToken: TagToken, text: string): string {
   if (text.split('\n').length <= 1) return text
 
-  const { input, content } = tagToken
-  if (!content) return text
-  const inputLine = input.split('\n').find((line) => line.includes(content))
-  if (!inputLine || !blockquoteRegexp.test(inputLine)) return text
-
-  const match = inputLine.match(blockquoteRegexp)
+  // Use this tag's own position because the same tag text can appear on other lines.
+  const { input, begin } = tagToken
+  const lineStart = input.lastIndexOf('\n', begin - 1) + 1
+  const match = input.slice(lineStart, begin).match(blockquoteRegexp)
   if (!match) return text
   const start = match[0]
   return text
 
@@ -2,6 +2,7 @@ import { afterAll, beforeAll, describe, expect, test } from 'vitest'
 
 import Page from '@/frame/lib/page'
 import { liquid } from '@/content-render/index'
+import { renderLiquid } from '@/content-render/liquid/index'
 import languages from '@/languages/lib/languages-server'
 import nonEnterpriseDefaultVersion from '@/versions/lib/non-enterprise-default-version'
 import { DataDirectory } from '@/tests/helpers/data-directory'
@@ -20,6 +21,8 @@ describe('data tag', () => {
         },
         reusables: {
           indented_code: 'Intro\n\n```yaml\nfoo:\n  bar: 1\n  list:\n    - a\n```',
+          multi: 'First line.\n\nSecond paragraph.',
+          'multi-longer': 'L1\nL2',
         },
         ui: {
           alerts: {},
@@ -74,4 +77,32 @@ describe('data tag', () => {
     )
     expect(rendered).toContain('> foo:\n>   bar: 1\n>   list:\n>     - a\n')
   })
+
+  test('prefixes only the blockquote use when a reusable appears in a blockquote first', async () => {
+    const rendered = await renderLiquid(
+      '> [!NOTE]\n> {% data reusables.multi %}\n\nText.\n\n{% data reusables.multi %}',
+      { currentLanguage: 'en' },
+    )
+    expect(rendered).toBe(
+      '> [!NOTE]\n> First line.\n> \n> Second paragraph.\n\nText.\n\nFirst line.\n\nSecond paragraph.',
+    )
+  })
+
+  test('prefixes only the blockquote use when a reusable appears in a blockquote last', async () => {
+    const rendered = await renderLiquid(
+      '{% data reusables.multi %}\n\nText.\n\n> [!NOTE]\n> {% data reusables.multi %}',
+      { currentLanguage: 'en' },
+    )
+    expect(rendered).toBe(
+      'First line.\n\nSecond paragraph.\n\nText.\n\n> [!NOTE]\n> First line.\n> \n> Second paragraph.',
+    )
+  })
+
+  test('does not prefix a reusable whose path is a prefix of a blockquoted reusable', async () => {
+    const rendered = await renderLiquid(
+      '> {% data reusables.multi-longer %}\n\n{% data reusables.multi %}',
+      { currentLanguage: 'en' },
+    )
+    expect(rendered).toBe('> L1\n> L2\n\nFirst line.\n\nSecond paragraph.')
+  })
 })