itest+lntest: add itest to reproduce bug #8535

itest/list_on_test.go

@@ -626,4 +626,8 @@ var allTestCases = []*lntest.TestCase{
 		Name:     "sweep commit output and anchor",
 		TestFunc: testSweepCommitOutputAndAnchor,
 	},
+	{
+		Name:     "coop close with external delivery",
+		TestFunc: testCoopCloseWithExternalDelivery,
+	},
 }