diff --git a/resources/tester/test_est_native_export.py b/resources/tester/test_est_native_export.py
index a7cc4682e..2012553c0 100644
--- a/resources/tester/test_est_native_export.py
+++ b/resources/tester/test_est_native_export.py
@@ -101,6 +101,17 @@ def test_quantity_document_edit_across_character_styles_preserves_tags():
     assert result == {"same": True, "tags": True}
 
 
+def test_quantity_document_edit_across_styles_and_separate_marker():
+    script = r"""const q=require('./tools/est-test/native-quantity.cjs'),w=require('./tools/est-test/export-quantity.cjs');
+      const doc='<cs nr=1/><cs nr=2/><div><c nr=1/>abc<c nr=2/>def<begin Tag=2 wpsty=[[Name:&#34;r000001&#34;;]]/>6<end Tag=2/></div>';
+      const old=q.fromWpt('A','문서',doc,[],{}),edited=structuredClone(old);
+      edited.rows[0].LineData=edited.rows[0].LineData.replace('bcde','변경').replace('6','12');
+      const next=w.editDocument(doc,old,edited),again=q.fromWpt('A','문서',next,[],{}),tags=x=>x.match(/<[^>]*>/g);
+      process.stdout.write(JSON.stringify({same:JSON.stringify(again)===JSON.stringify(edited),tags:JSON.stringify(tags(doc))===JSON.stringify(tags(next))}));"""
+    result = json.loads(subprocess.check_output(["node", "-e", script], cwd=ROOT).decode("utf-8"))
+    assert result == {"same": True, "tags": True}
+
+
 def test_multiple_quantity_text_segments_preserve_original_tags_when_sample_exists():
     sample = Path("C:/Dasansoft/Est Plus 2/Data/ProjectData/main.estx")
     if not sample.exists():
diff --git a/tools/est-test/export-quantity.cjs b/tools/est-test/export-quantity.cjs
index 56ce016c0..7167ae5c0 100644
--- a/tools/est-test/export-quantity.cjs
+++ b/tools/est-test/export-quantity.cjs
@@ -121,7 +121,9 @@ function editDocument(text, oldSheet, sheet) {
         if (previous[i] === next[i]) continue;
         previous[i] = next[i];
         const updated = { ...current, LineData: previous.join("") };
-        const patched = editRun(candidate, current, updated, parse);
+        const patched =
+          editRun(candidate, current, updated, parse) ||
+          editStyledRuns(candidate, current, updated, parse);
         if (!patched) break;
         candidate = patched;
         current = updated;