diff --git a/StyleCop.Analyzers/StyleCop.Analyzers.Test/DocumentationRules/SA1629UnitTests.cs b/StyleCop.Analyzers/StyleCop.Analyzers.Test/DocumentationRules/SA1629UnitTests.cs
index f86afd24e..f31c5ffad 100644
--- a/StyleCop.Analyzers/StyleCop.Analyzers.Test/DocumentationRules/SA1629UnitTests.cs
+++ b/StyleCop.Analyzers/StyleCop.Analyzers.Test/DocumentationRules/SA1629UnitTests.cs
@@ -1,8 +1,6 @@
 // Copyright (c) Tunnel Vision Laboratories, LLC. All Rights Reserved.
 // Licensed under the MIT License. See LICENSE in the project root for license information.
 
-#nullable disable
-
 namespace StyleCop.Analyzers.Test.DocumentationRules
 {
     using System.Threading;
@@ -962,10 +960,32 @@ public interface ITest
             await VerifyCSharpDiagnosticAsync(testCode, testSettings, expectedResult, CancellationToken.None).ConfigureAwait(false);
         }
 
+        [Theory]
+        [InlineData("<")]
+        [InlineData("&")]
+        [InlineData(""")]
+        [WorkItem(3802, "https://github.com/DotNetAnalyzers/StyleCopAnalyzers/issues/3802")]
+        public async Task TestSentenceEndingWithXmlEntityAsync(string xmlEntity)
+        {
+            var testCode = $@"
+/// <summary>Something {xmlEntity}[|<|]/summary>
+public class TestClass
+{{
+}}";
+
+            var fixedTestCode = $@"
+/// <summary>Something {xmlEntity}.</summary>
+public class TestClass
+{{
+}}";
+
+            await VerifyCSharpFixAsync(testCode, DiagnosticResult.EmptyDiagnosticResults, fixedTestCode, CancellationToken.None).ConfigureAwait(false);
+        }
+
         private static Task VerifyCSharpDiagnosticAsync(string source, DiagnosticResult[] expected, CancellationToken cancellationToken)
             => VerifyCSharpDiagnosticAsync(source, testSettings: null, expected, cancellationToken);
 
-        private static Task VerifyCSharpDiagnosticAsync(string source, string testSettings, DiagnosticResult[] expected, CancellationToken cancellationToken)
+        private static Task VerifyCSharpDiagnosticAsync(string source, string? testSettings, DiagnosticResult[] expected, CancellationToken cancellationToken)
         {
             var test = CreateTest(testSettings, expected);
             test.TestCode = source;
@@ -985,7 +1005,7 @@ private static Task VerifyCSharpFixAsync(string source, DiagnosticResult[] expec
             return test.RunAsync(cancellationToken);
         }
 
-        private static StyleCopCodeFixVerifier<SA1629DocumentationTextMustEndWithAPeriod, SA1629CodeFixProvider>.CSharpTest CreateTest(string testSettings, DiagnosticResult[] expected)
+        private static StyleCopCodeFixVerifier<SA1629DocumentationTextMustEndWithAPeriod, SA1629CodeFixProvider>.CSharpTest CreateTest(string? testSettings, DiagnosticResult[] expected)
         {
             string contentClassInheritDoc = @"<?xml version=""1.0"" encoding=""utf-8"" ?>
 <TestClass>
diff --git a/StyleCop.Analyzers/StyleCop.Analyzers/DocumentationRules/SA1629DocumentationTextMustEndWithAPeriod.cs b/StyleCop.Analyzers/StyleCop.Analyzers/DocumentationRules/SA1629DocumentationTextMustEndWithAPeriod.cs
index 6f16360cf..2a0f774cd 100644
--- a/StyleCop.Analyzers/StyleCop.Analyzers/DocumentationRules/SA1629DocumentationTextMustEndWithAPeriod.cs
+++ b/StyleCop.Analyzers/StyleCop.Analyzers/DocumentationRules/SA1629DocumentationTextMustEndWithAPeriod.cs
@@ -11,6 +11,7 @@ namespace StyleCop.Analyzers.DocumentationRules
     using System.Linq;
     using System.Xml.Linq;
     using Microsoft.CodeAnalysis;
+    using Microsoft.CodeAnalysis.CSharp;
     using Microsoft.CodeAnalysis.CSharp.Syntax;
     using Microsoft.CodeAnalysis.Diagnostics;
     using Microsoft.CodeAnalysis.Text;
@@ -132,7 +133,8 @@ private static void HandleSectionOrBlockXmlElement(SyntaxNodeAnalysisContext con
                                 int spanStart = textToken.SpanStart + textWithoutTrailingWhitespace.Length;
                                 ImmutableDictionary<string, string> properties = null;
                                 if (textWithoutTrailingWhitespace.EndsWith(",", StringComparison.Ordinal)
-                                    || textWithoutTrailingWhitespace.EndsWith(";", StringComparison.Ordinal))
+                                    || (textWithoutTrailingWhitespace.EndsWith(";", StringComparison.Ordinal)
+                                        && !textToken.IsKind(SyntaxKind.XmlEntityLiteralToken)))
                                 {
                                     spanStart -= 1;
                                     SetReplaceChar();