diff -U3 /tmp/cirrus-ci-build/src/test/modules/nbtree/expected/backwards.out /tmp/cirrus-ci-build/build/testrun/nbtree/isolation/results/backwards.out
--- /tmp/cirrus-ci-build/src/test/modules/nbtree/expected/backwards.out	2025-07-09 03:22:42.701999000 +0000
+++ /tmp/cirrus-ci-build/build/testrun/nbtree/isolation/results/backwards.out	2025-07-09 03:26:13.802340000 +0000
@@ -1,24 +1,8 @@
 Parsed test spec with 2 sessions
 
 starting permutation: b_scan i_insert i_detach
-step b_scan: SELECT * FROM backwards_scan_tbl WHERE col % 100 = 1 ORDER BY col DESC; <waiting ...>
-step i_insert: INSERT INTO backwards_scan_tbl SELECT i FROM generate_series(-2000, 700) i;
-step i_detach: 
-  SELECT injection_points_detach('lock-and-validate-left');
-  SELECT injection_points_wakeup('lock-and-validate-left');
-
-injection_points_detach
------------------------
-                       
-(1 row)
-
-injection_points_wakeup
------------------------
-                       
-(1 row)
-
-backwards_scan_session: NOTICE:  notice triggered for injection point lock-and-validate-new-lastcurrblkno
-step b_scan: <... completed>
+backwards_scan_session: WARNING:  INJECTION_POINT lock-and-validate-left
+step b_scan: SELECT * FROM backwards_scan_tbl WHERE col % 100 = 1 ORDER BY col DESC;
 col
 ---
 601
@@ -30,3 +14,14 @@
   1
 (7 rows)
 
+step i_insert: INSERT INTO backwards_scan_tbl SELECT i FROM generate_series(-2000, 700) i;
+step i_detach: 
+  SELECT injection_points_detach('lock-and-validate-left');
+  SELECT injection_points_wakeup('lock-and-validate-left');
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+ERROR:  could not find injection point lock-and-validate-left to wake up