diff -U3 /Users/admin/pgsql/src/test/modules/injection_points/expected/cluster.out /Users/admin/pgsql/build/testrun/injection_points/isolation/results/cluster.out
--- /Users/admin/pgsql/src/test/modules/injection_points/expected/cluster.out	2024-09-04 04:41:57
+++ /Users/admin/pgsql/build/testrun/injection_points/isolation/results/cluster.out	2024-09-04 04:46:38
@@ -8,7 +8,8 @@
 
 step wait_before_lock: 
 	CLUSTER (CONCURRENTLY) clstr_test USING clstr_test_pkey;
- <waiting ...>
+
+ERROR:  could not access file "pgoutput_cluster": No such file or directory
 step change_existing: 
 	UPDATE clstr_test SET i=10 where i=1;
 	UPDATE clstr_test SET j=20 where i=2;
@@ -63,12 +64,7 @@
 step wakeup_before_lock: 
 	SELECT injection_points_wakeup('cluster-concurrently-before-lock');
 
-injection_points_wakeup
------------------------
-                       
-(1 row)
-
-step wait_before_lock: <... completed>
+ERROR:  could not find injection point cluster-concurrently-before-lock to wake up
 step check1: 
 	INSERT INTO relfilenodes(node)
 	SELECT relfilenode FROM pg_class WHERE relname='clstr_test';
@@ -86,7 +82,7 @@
 
 count
 -----
-    2
+    1
 (1 row)
 
   i|  j
@@ -125,16 +121,12 @@
 
 step wait_after_lock: 
 	CLUSTER (CONCURRENTLY) clstr_test USING clstr_test_pkey;
- <waiting ...>
+
+ERROR:  could not access file "pgoutput_cluster": No such file or directory
 step wakeup_after_lock: 
 	SELECT injection_points_wakeup('cluster-concurrently-after-lock');
 
-injection_points_wakeup
------------------------
-                       
-(1 row)
-
-step wait_after_lock: <... completed>
+ERROR:  could not find injection point cluster-concurrently-after-lock to wake up
 injection_points_detach
 -----------------------
                        
@@ -152,34 +144,7 @@
                        
 (1 row)
 
-step wait_after_lock: 
-	CLUSTER (CONCURRENTLY) clstr_test USING clstr_test_pkey;
- <waiting ...>
-step after_lock_delay: 
-    SELECT pg_sleep(1.5);
+PQconsumeInput failed: server closed the connection unexpectedly
+	This probably means the server terminated abnormally
+	before or while processing the request.
 
-pg_sleep
---------
-        
-(1 row)
-
-step wakeup_after_lock: 
-	SELECT injection_points_wakeup('cluster-concurrently-after-lock');
-
-injection_points_wakeup
------------------------
-                       
-(1 row)
-
-step wait_after_lock: <... completed>
-ERROR:  could not process concurrent data changes in time
-injection_points_detach
------------------------
-                       
-(1 row)
-
-injection_points_detach
------------------------
-                       
-(1 row)
-