diff --git a/sw/qa/extras/uiwriter/data/redline-autocorrect2.fodt b/sw/qa/extras/uiwriter/data/redline-autocorrect2.fodt
new file mode 100644
index 000000000000..4d65c5f465a2
--- /dev/null
+++ b/sw/qa/extras/uiwriter/data/redline-autocorrect2.fodt
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<office:document xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0" xmlns:style="urn:oasis:names:tc:opendocument:xmlns:style:1.0" xmlns:text="urn:oasis:names:tc:opendocument:xmlns:text:1.0" xmlns:fo="urn:oasis:names:tc:opendocument:xmlns:xsl-fo-compatible:1.0" xmlns:officeooo="http://openoffice.org/2009/office" office:version="1.2" office:mimetype="application/vnd.oasis.opendocument.text" xmlns:dc="http://purl.org/dc/elements/1.1/">
+ <office:styles>
+  <style:style style:name="Standard" style:family="paragraph" style:class="text"/>
+  <style:default-style style:family="paragraph">
+   <style:text-properties fo:language="en" fo:country="GB"/>
+  </style:default-style>
+ </office:styles>
+ <office:body>
+  <office:text>
+   <text:tracked-changes text:track-changes="false">
+    <text:changed-region xml:id="ct94099223789984" text:id="ct94099223789984">
+     <text:deletion>
+      <office:change-info>
+       <dc:creator>Unknown Author</dc:creator>
+       <dc:date>2020-11-03T19:19:05</dc:date>
+      </office:change-info>
+     </text:deletion>
+    </text:changed-region>
+   </text:tracked-changes>
+   <text:p text:style-name="P1">Lorem<text:change-start text:change-id="ct94099223789984"/>,<text:change-end text:change-id="ct94099223789984"/></text:p>
+  </office:text>
+ </office:body>
+</office:document>
diff --git a/sw/qa/extras/uiwriter/uiwriter.cxx b/sw/qa/extras/uiwriter/uiwriter.cxx
index aca558b923a6..2acfc17b7082 100644
--- a/sw/qa/extras/uiwriter/uiwriter.cxx
+++ b/sw/qa/extras/uiwriter/uiwriter.cxx
@@ -391,6 +391,7 @@ public:
     void testInsertLongDateFormat();
     void testSpellOnlineParameter();
     void testRedlineAutoCorrect();
+    void testRedlineAutoCorrect2();
 #if HAVE_FEATURE_PDFIUM
     void testInsertPdf();
 #endif
@@ -618,6 +619,7 @@ public:
     CPPUNIT_TEST(testInsertLongDateFormat);
     CPPUNIT_TEST(testSpellOnlineParameter);
     CPPUNIT_TEST(testRedlineAutoCorrect);
+    CPPUNIT_TEST(testRedlineAutoCorrect2);
 #if HAVE_FEATURE_PDFIUM
     CPPUNIT_TEST(testInsertPdf);
 #endif
@@ -7638,7 +7640,15 @@ void SwUiWriterTest::testRedlineAutoCorrect()
     pWrtShell->Insert("et");
     pWrtShell->AutoCorrect(corr, ' ');
     // This was "Ttest" removing the tracked deletion silently.
-    sReplaced = "ttest ";
+    // Don't replace, if a redline starts or ends within the text.
+    sReplaced = "tset ";
+    nIndex = pWrtShell->GetCursor()->GetNode().GetIndex();
+    CPPUNIT_ASSERT_EQUAL(sReplaced, static_cast<SwTextNode*>(pDoc->GetNodes()[nIndex])->GetText());
+
+    // Otherwise replace it
+    pWrtShell->Insert("tset");
+    pWrtShell->AutoCorrect(corr, ' ');
+    sReplaced = "tset test ";
     nIndex = pWrtShell->GetCursor()->GetNode().GetIndex();
     CPPUNIT_ASSERT_EQUAL(sReplaced, static_cast<SwTextNode*>(pDoc->GetNodes()[nIndex])->GetText());
 
@@ -7646,11 +7656,43 @@ void SwUiWriterTest::testRedlineAutoCorrect()
     dispatchCommand(mxComponent, ".uno:GoToStartOfDoc", {});
     pWrtShell->Insert("a");
     pWrtShell->AutoCorrect(corr, ' ');
-    sReplaced = "A ttest ";
+    sReplaced = "A tset test ";
     nIndex = pWrtShell->GetCursor()->GetNode().GetIndex();
     CPPUNIT_ASSERT_EQUAL(sReplaced, static_cast<SwTextNode*>(pDoc->GetNodes()[nIndex])->GetText());
 }
 
+void SwUiWriterTest::testRedlineAutoCorrect2()
+{
+    SwDoc* pDoc = createDoc("redline-autocorrect2.fodt");
+    SwWrtShell* pWrtShell = pDoc->GetDocShell()->GetWrtShell();
+
+    dispatchCommand(mxComponent, ".uno:GoToEndOfDoc", {});
+
+    // show tracked deletion
+    RedlineFlags const nMode(pWrtShell->GetRedlineFlags() | RedlineFlags::On);
+    CPPUNIT_ASSERT(nMode & (RedlineFlags::ShowDelete | RedlineFlags::ShowInsert));
+    pWrtShell->SetRedlineFlags(nMode);
+    CPPUNIT_ASSERT(nMode & RedlineFlags::ShowDelete);
+
+    SwAutoCorrect corr(*SvxAutoCorrCfg::Get().GetAutoCorrect());
+    pWrtShell->Insert("...");
+    pWrtShell->AutoCorrect(corr, ' ');
+    sal_uLong nIndex = pWrtShell->GetCursor()->GetNode().GetIndex();
+
+    // This was "LoremLorem,…," (duplicating the deleted comma, but without deletion)
+    // Don't replace, if a redline starts or ends within the text.
+    OUString sReplaced = "Lorem,... ";
+    nIndex = pWrtShell->GetCursor()->GetNode().GetIndex();
+    CPPUNIT_ASSERT_EQUAL(sReplaced, static_cast<SwTextNode*>(pDoc->GetNodes()[nIndex])->GetText());
+
+    // Continue it:
+    pWrtShell->Insert("Lorem,...");
+    pWrtShell->AutoCorrect(corr, ' ');
+    nIndex = pWrtShell->GetCursor()->GetNode().GetIndex();
+    sReplaced = u"Lorem,... Lorem,… ";
+    CPPUNIT_ASSERT_EQUAL(sReplaced, static_cast<SwTextNode*>(pDoc->GetNodes()[nIndex])->GetText());
+}
+
 void SwUiWriterTest::testTdf108423()
 {
     SwDoc* pDoc = createDoc();
diff --git a/sw/source/core/edit/acorrect.cxx b/sw/source/core/edit/acorrect.cxx
index 7ae0a778a59b..d7003ccfbaed 100644
--- a/sw/source/core/edit/acorrect.cxx
+++ b/sw/source/core/edit/acorrect.cxx
@@ -40,6 +40,8 @@
 #include <svl/zformat.hxx>
 
 #include <editeng/acorrcfg.hxx>
+#include <redline.hxx>
+#include <IDocumentRedlineAccess.hxx>
 
 using namespace ::com::sun::star;
 
@@ -427,8 +429,28 @@ bool SwAutoCorrDoc::ChgAutoCorrWord( sal_Int32& rSttPos, sal_Int32 nEndPos,
         const bool replaceLastChar = sFrameText.getLength() > nEndPos && pFnd->GetShort()[0] == ':'
                                      && pFnd->GetShort().endsWith(":");
 
-        SwPaM aPam(pFrame->MapViewToModelPos(TextFrameIndex(rSttPos)),
-                   pFrame->MapViewToModelPos(TextFrameIndex(nEndPos + (replaceLastChar ? 1 : 0))));
+        SwPosition aStartPos( pFrame->MapViewToModelPos(TextFrameIndex(rSttPos) ));
+        SwPosition aEndPos( pFrame->MapViewToModelPos(TextFrameIndex(nEndPos + (replaceLastChar ? 1 : 0))) );
+        SwPaM aPam(aStartPos, aEndPos);
+
+        // don't replace, if a redline starts or ends within the original text
+        for ( SwRedlineTable::size_type nAct =
+                  pDoc->getIDocumentRedlineAccess().GetRedlinePos( m_rCursor.GetNode(), RedlineType::Any );
+                  nAct < pDoc->getIDocumentRedlineAccess().GetRedlineTable().size(); ++nAct )
+        {
+            const SwRangeRedline* pRed = pDoc->getIDocumentRedlineAccess().GetRedlineTable()[ nAct ];
+
+            if ( pRed->Start()->nNode > pTextNd->GetIndex() )
+                break;
+
+            // redline over the original text
+            if ( aStartPos < *pRed->End() && *pRed->Start() < aEndPos &&
+                 // starting or ending within the original text
+                 ( aStartPos < *pRed->Start() || *pRed->End() < aEndPos ) )
+            {
+                return bRet;
+            }
+        }
 
         if( pFnd->IsTextOnly() )
         {
diff --git a/test/Package_unittest.mk b/test/Package_unittest.mk
index 5973615edfed..2aabc9272eb4 100644
--- a/test/Package_unittest.mk
+++ b/test/Package_unittest.mk
@@ -24,6 +24,7 @@ $(eval $(call gb_Package_add_file,test_unittest,unittest/user/autotext/en-US/sta
 $(eval $(call gb_Package_add_file,test_unittest,unittest/user/autotext/en-US/crdbus50.bau,user/autotext/en-US/crdbus50.bau))
 $(eval $(call gb_Package_add_file,test_unittest,unittest/user/config/soffice.cfg/.dummy,empty-directory-dummy))
 $(eval $(call gb_Package_add_file,test_unittest,unittest/user/autocorr/acor_en-US.dat,user/autocorr/acor_fr.dat))
+$(eval $(call gb_Package_add_file,test_unittest,unittest/user/autocorr/acor_en-GB.dat,user/autocorr/acor_en-GB.dat))
 $(eval $(call gb_Package_add_file,test_unittest,unittest/user/config/soffice.cfg/modules/scalc/popupmenu/draw.xml,user/config/soffice.cfg/modules/scalc/popupmenu/draw.xml))
 $(eval $(call gb_Package_add_file,test_unittest,unittest/user/config/soffice.cfg/modules/scalc/popupmenu/anchor.xml,user/config/soffice.cfg/modules/scalc/popupmenu/anchor.xml))
 $(eval $(call gb_Package_add_file,test_unittest,unittest/user/config/soffice.cfg/modules/swriter/popupmenu/text.xml,user/config/soffice.cfg/modules/swriter/popupmenu/text.xml))
diff --git a/test/user-template/user/autocorr/acor_en-GB.dat b/test/user-template/user/autocorr/acor_en-GB.dat
new file mode 100644
index 000000000000..b74f1834caac
Binary files /dev/null and b/test/user-template/user/autocorr/acor_en-GB.dat differ