diff --git a/apps/desktop/src/components/assistant-ui/markdown-text.test.ts b/apps/desktop/src/components/assistant-ui/markdown-text.test.ts
index b7c29620f5..2d67bf17c4 100644
--- a/apps/desktop/src/components/assistant-ui/markdown-text.test.ts
+++ b/apps/desktop/src/components/assistant-ui/markdown-text.test.ts
@@ -574,6 +574,12 @@ describe('preprocessMarkdown', () => {
     expect(output).not.toContain('\\$x^2')
   })
 
+  it('keeps every real inline math span when CJK prose separates them (#123163)', () => {
+    expect(preprocessMarkdown('$E = mc^2$ 代入 $x$ 求解')).toBe('$E = mc^2$ 代入 $x$ 求解')
+    expect(preprocessMarkdown('$a$ 与 $b$ 之间的说明')).toBe('$a$ 与 $b$ 之间的说明')
+    expect(preprocessMarkdown('$a$ 甲 $b$ 乙 $c$ 丙')).toBe('$a$ 甲 $b$ 乙 $c$ 丙')
+  })
+
   it('leaves real inline math adjacent to CJK untouched (#103546)', () => {
     const output = preprocessMarkdown('其中 $\\alpha = 1$，所以')
 
diff --git a/apps/desktop/src/lib/markdown-preprocess.ts b/apps/desktop/src/lib/markdown-preprocess.ts
index 87efb8ebb9..b1f5caf63a 100644
--- a/apps/desktop/src/lib/markdown-preprocess.ts
+++ b/apps/desktop/src/lib/markdown-preprocess.ts
@@ -658,9 +658,12 @@ const CJK_RE = /[\u3000-\u303f\u3040-\u30ff\u3400-\u4dbf\u4e00-\u9fff\uf900-\ufa
  * Escaping only the OPENING `$` is enough: the closing `$` loses its partner
  * and renders literally. Real math is untouched — its body carries no CJK —
  * and `$$` display runs are skipped by the same `$$`-run guard the currency
- * escape uses. The one accepted tradeoff: genuine inline math whose body
- * names a CJK variable (`$x = 变量$`) renders as literal prose. Losing one
- * equation is far cheaper than corrupting a sentence's copy-out.
+ * escape uses. A non-CJK span is consumed through its closer: otherwise that
+ * closer is scanned as the next opener, and CJK prose between two formulas
+ * makes the escape land on the first equation's real closing `$`. The one
+ * accepted tradeoff: genuine inline math whose body names a CJK variable
+ * (`$x = 变量$`) renders as literal prose. Losing one equation is far cheaper
+ * than corrupting a sentence's copy-out.
  */
 function escapeCjkProseDollars(text: string): string {
   let out = ''
@@ -680,6 +683,7 @@ function escapeCjkProseDollars(text: string): string {
     const body = text.slice(cursor + 1, closingIndex)
 
     if (!CJK_RE.test(body)) {
+      cursor = closingIndex
       continue
     }