@@ -59,6 +59,14 @@ public void InheritedFromInheritedClassIsSelf()
             Assert.IsTrue(PythonReferenceComparer.Instance.Equals(b, bInstanceClass));
         }
 
+        // https://github.com/pythonnet/pythonnet/issues/1420
+        [Test]
+        public void CallBaseMethodFromContainerInNestedClass()
+        {
+            using var nested = new ContainerClass.InnerClass().ToPython();
+            nested.InvokeMethod(nameof(ContainerClass.BaseMethod));
+        }
+
         [Test]
         public void Grandchild_PassesExtraBaseInstanceCheck()
         {
@@ -183,4 +191,14 @@ public int XProp
             set => this.extras[nameof(this.XProp)] = value;
         }
     }
+
+    public class ContainerClass
+    {
+        public void BaseMethod() { }
+
+        public class InnerClass: ContainerClass
+        {
+
+        }
+    }
 }
Original file line number	Diff line number	Diff line change
@@ -59,6 +59,14 @@ public void InheritedFromInheritedClassIsSelf()
59	59	Assert.IsTrue(PythonReferenceComparer.Instance.Equals(b, bInstanceClass));
60	60	}
61	61
	62	+ // https://github.com/pythonnet/pythonnet/issues/1420
	63	+ [Test]
	64	+ public void CallBaseMethodFromContainerInNestedClass()
	65	+ {
	66	+ using var nested = new ContainerClass.InnerClass().ToPython();
	67	+ nested.InvokeMethod(nameof(ContainerClass.BaseMethod));
	68	+ }
	69	+
62	70	[Test]
63	71	public void Grandchild_PassesExtraBaseInstanceCheck()
64	72	{
@@ -183,4 +191,14 @@ public int XProp
183	191	set => this.extras[nameof(this.XProp)] = value;
184	192	}
185	193	}
	194	+
	195	+ public class ContainerClass
	196	+ {
	197	+ public void BaseMethod() { }
	198	+
	199	+ public class InnerClass: ContainerClass
	200	+ {
	201	+
	202	+ }
	203	+ }
186	204	}