diff --git a/src/cmd/compile/internal/types2/lookup.go b/src/cmd/compile/internal/types2/lookup.go
index 893cdb157d..014a5489cd 100644
--- a/src/cmd/compile/internal/types2/lookup.go
+++ b/src/cmd/compile/internal/types2/lookup.go
@@ -445,8 +445,18 @@ func (check *Checker) missingMethod(V, T Type, static bool, equivalent func(x, y
 				// Add package information to disambiguate (go.dev/issue/54258).
 				fs, ms = check.funcString(f, true), check.funcString(m, true)
 			}
-			*cause = check.sprintf("(wrong type for method %s)\n\t\thave %s\n\t\twant %s",
-				m.Name(), fs, ms)
+			if fs == ms {
+				// We still have "want Foo, have Foo".
+				// This is most likely due to different type parameters with
+				// the same name appearing in the instantiated signatures
+				// (go.dev/issue/61685).
+				// Rather than reporting this misleading error cause, for now
+				// just point out that the method signature is incorrect.
+				// TODO(gri) should find a good way to report the root cause
+				*cause = check.sprintf("(wrong type for method %s)", m.Name())
+				break
+			}
+			*cause = check.sprintf("(wrong type for method %s)\n\t\thave %s\n\t\twant %s", m.Name(), fs, ms)
 		case ambigSel:
 			*cause = check.sprintf("(ambiguous selector %s.%s)", V, m.Name())
 		case ptrRecv:
diff --git a/src/go/types/lookup.go b/src/go/types/lookup.go
index 2857ba358c..05d30c178a 100644
--- a/src/go/types/lookup.go
+++ b/src/go/types/lookup.go
@@ -447,8 +447,18 @@ func (check *Checker) missingMethod(V, T Type, static bool, equivalent func(x, y
 				// Add package information to disambiguate (go.dev/issue/54258).
 				fs, ms = check.funcString(f, true), check.funcString(m, true)
 			}
-			*cause = check.sprintf("(wrong type for method %s)\n\t\thave %s\n\t\twant %s",
-				m.Name(), fs, ms)
+			if fs == ms {
+				// We still have "want Foo, have Foo".
+				// This is most likely due to different type parameters with
+				// the same name appearing in the instantiated signatures
+				// (go.dev/issue/61685).
+				// Rather than reporting this misleading error cause, for now
+				// just point out that the method signature is incorrect.
+				// TODO(gri) should find a good way to report the root cause
+				*cause = check.sprintf("(wrong type for method %s)", m.Name())
+				break
+			}
+			*cause = check.sprintf("(wrong type for method %s)\n\t\thave %s\n\t\twant %s", m.Name(), fs, ms)
 		case ambigSel:
 			*cause = check.sprintf("(ambiguous selector %s.%s)", V, m.Name())
 		case ptrRecv:
diff --git a/src/internal/types/testdata/fixedbugs/issue61685.go b/src/internal/types/testdata/fixedbugs/issue61685.go
new file mode 100644
index 0000000000..b88b222eb9
--- /dev/null
+++ b/src/internal/types/testdata/fixedbugs/issue61685.go
@@ -0,0 +1,15 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package p
+
+func _[T any](x any) {
+	f /* ERROR "T (type I[T]) does not satisfy I[T] (wrong type for method m)" */ (x.(I[T]))
+}
+
+func f[T I[T]](T) {}
+
+type I[T any] interface {
+	m(T)
+}