diff --git a/ILSpy.Tests/AssemblyList/NestedNamespaceTreeTests.cs b/ILSpy.Tests/AssemblyList/NestedNamespaceTreeTests.cs
index 2bf7c53a9..f41b9b03b 100644
--- a/ILSpy.Tests/AssemblyList/NestedNamespaceTreeTests.cs
+++ b/ILSpy.Tests/AssemblyList/NestedNamespaceTreeTests.cs
@@ -22,12 +22,14 @@ using System.Threading.Tasks;
 
 using Avalonia.Headless.NUnit;
 
+using ICSharpCode.Decompiler;
 using ICSharpCode.Decompiler.TypeSystem;
 using ICSharpCode.ILSpyX;
 
 using ICSharpCode.ILSpy;
 using ICSharpCode.ILSpy.AppEnv;
 using ICSharpCode.ILSpy.AssemblyTree;
+using ICSharpCode.ILSpy.Languages;
 using ICSharpCode.ILSpy.TreeNodes;
 
 using NUnit.Framework;
@@ -143,6 +145,36 @@ public class NestedNamespaceTreeTests
 		}
 	}
 
+	[AvaloniaTest]
+	public async Task Decompiling_A_Nested_Namespace_Uses_Its_Full_Path_Not_The_Display_Label()
+	{
+		// In nested mode a NamespaceTreeNode's display label is only its last segment ("Generic"),
+		// while the metadata it has to query -- and the name it titles the output with -- is the full
+		// path ("System.Collections.Generic"). Decompiling by the label queries the wrong namespace,
+		// usually an empty one, and titles the output after the wrong name.
+
+		try
+		{
+			var (_, assemblyNode) = await BootNestedAsync(TreeNavigation.CoreLibName);
+
+			var generic = assemblyNode.Children.OfType<NamespaceTreeNode>()
+				.SelectMany(DescendantNamespaces)
+				.Single(ns => ns.FullName == "System.Collections.Generic");
+
+			var language = AppComposition.Current.GetExport<LanguageService>()
+				.Languages.OfType<CSharpLanguage>().First();
+			var output = new PlainTextOutput();
+			generic.Decompile(language, output, new DecompilationOptions(new DecompilerSettings()));
+
+			Assert.That(output.ToString(), Does.Contain("System.Collections.Generic"),
+				"the namespace is decompiled and titled by its full path, not the 'Generic' display label");
+		}
+		finally
+		{
+			ResetNestedMode();
+		}
+	}
+
 	[AvaloniaTest]
 	public async Task FindNamespaceNode_Resolves_A_Nested_Namespace()
 	{
diff --git a/ILSpy/Commands/SearchMsdnContextMenuEntry.cs b/ILSpy/Commands/SearchMsdnContextMenuEntry.cs
index 8c025973b..062ccdf08 100644
--- a/ILSpy/Commands/SearchMsdnContextMenuEntry.cs
+++ b/ILSpy/Commands/SearchMsdnContextMenuEntry.cs
@@ -72,8 +72,8 @@ namespace ICSharpCode.ILSpy.Commands
 		{
 			switch (node)
 			{
-				case NamespaceTreeNode ns when !string.IsNullOrEmpty(ns.Name):
-					return (MsdnPrefix + ns.Name).ToLowerInvariant();
+				case NamespaceTreeNode ns when !string.IsNullOrEmpty(ns.FullName):
+					return (MsdnPrefix + ns.FullName).ToLowerInvariant();
 				case IMemberTreeNode m when m.Member is { } entity:
 					// Reflection-name → docs path: backticks (generic arity) become hyphens,
 					// `+` (nested type) becomes `.`, and ".ctor" gets a "-ctor" tail because
@@ -96,7 +96,7 @@ namespace ICSharpCode.ILSpy.Commands
 			switch (node)
 			{
 				case NamespaceTreeNode ns:
-					return !string.IsNullOrEmpty(ns.Name);
+					return !string.IsNullOrEmpty(ns.FullName);
 				case IMemberTreeNode m when m.Member is { } entity:
 					if (!IsExternallyVisible(entity.Accessibility))
 						return false;
diff --git a/ILSpy/Search/ScopeSearchToNamespaceContextMenuEntry.cs b/ILSpy/Search/ScopeSearchToNamespaceContextMenuEntry.cs
index a01ac7610..44e1653a8 100644
--- a/ILSpy/Search/ScopeSearchToNamespaceContextMenuEntry.cs
+++ b/ILSpy/Search/ScopeSearchToNamespaceContextMenuEntry.cs
@@ -60,7 +60,7 @@ namespace ICSharpCode.ILSpy.Search
 		static string? Namespace(TextViewContext context)
 		{
 			if (context.SelectedTreeNodes is { Length: > 0 } nodes && nodes.All(n => n is NamespaceTreeNode))
-				return nodes.OfType<NamespaceTreeNode>().FirstOrDefault()?.Name;
+				return nodes.OfType<NamespaceTreeNode>().FirstOrDefault()?.FullName;
 			return (context.Reference?.Reference as IEntity)?.Namespace;
 		}
 	}
diff --git a/ILSpy/TreeNodes/NamespaceTreeNode.cs b/ILSpy/TreeNodes/NamespaceTreeNode.cs
index 2f1d6917d..7915edaff 100644
--- a/ILSpy/TreeNodes/NamespaceTreeNode.cs
+++ b/ILSpy/TreeNodes/NamespaceTreeNode.cs
@@ -96,8 +96,8 @@ namespace ICSharpCode.ILSpy.TreeNodes
 				return;
 			}
 			var types = typeSystem.MainModule.TypeDefinitions
-				.Where(t => t.Namespace == name && t.DeclaringTypeDefinition == null);
-			language.DecompileNamespace(name, types, output, options);
+				.Where(t => t.Namespace == fullName && t.DeclaringTypeDefinition == null);
+			language.DecompileNamespace(fullName, types, output, options);
 		}
 
 		// A namespace counts as public-API iff at least one type it contains is public-API. The