diff -U3 /tmp/cirrus-ci-build/src/test/regress/expected/select_parallel.out /tmp/cirrus-ci-build/src/bin/pg_upgrade/tmp_check/results/select_parallel.out
--- /tmp/cirrus-ci-build/src/test/regress/expected/select_parallel.out	2025-05-15 22:51:08.348098594 +0000
+++ /tmp/cirrus-ci-build/src/bin/pg_upgrade/tmp_check/results/select_parallel.out	2025-05-15 22:56:57.381403065 +0000
@@ -1390,7 +1390,6 @@
 select set_role_and_error(0);
 ERROR:  division by zero
 CONTEXT:  SQL function "set_role_and_error" statement 1
-parallel worker
 reset debug_parallel_query;
 drop function set_and_report_role();
 drop function set_role_and_error(int);
diff -U3 /tmp/cirrus-ci-build/src/test/regress/expected/plpgsql.out /tmp/cirrus-ci-build/src/bin/pg_upgrade/tmp_check/results/plpgsql.out
--- /tmp/cirrus-ci-build/src/test/regress/expected/plpgsql.out	2025-05-15 22:51:08.332041932 +0000
+++ /tmp/cirrus-ci-build/src/bin/pg_upgrade/tmp_check/results/plpgsql.out	2025-05-15 22:57:13.317682433 +0000
@@ -4111,15 +4111,11 @@
 $$ language plpgsql parallel safe;
 set debug_parallel_query to on;
 explain (verbose, costs off) select error_trap_test();
-            QUERY PLAN             
------------------------------------
- Gather
-   Output: (error_trap_test())
-   Workers Planned: 1
-   Single Copy: true
-   ->  Result
-         Output: error_trap_test()
-(6 rows)
+         QUERY PLAN          
+-----------------------------
+ Result
+   Output: error_trap_test()
+(2 rows)
 
 select error_trap_test();
       error_trap_test      
diff -U3 /tmp/cirrus-ci-build/src/test/regress/expected/partition_prune.out /tmp/cirrus-ci-build/src/bin/pg_upgrade/tmp_check/results/partition_prune.out
--- /tmp/cirrus-ci-build/src/test/regress/expected/partition_prune.out	2025-05-15 22:51:08.328027766 +0000
+++ /tmp/cirrus-ci-build/src/bin/pg_upgrade/tmp_check/results/partition_prune.out	2025-05-15 22:57:22.945862905 +0000
@@ -4156,19 +4156,16 @@
 -- Ensure that listp_12_2 is not scanned.  (The nested Append is not seen in
 -- the plan as it's pulled in setref.c due to having just a single subnode).
 select explain_parallel_append('select * from listp where a = (select 1);');
-                       explain_parallel_append                        
-----------------------------------------------------------------------
- Gather (actual rows=N loops=N)
-   Workers Planned: 2
-   Workers Launched: N
+                   explain_parallel_append                    
+--------------------------------------------------------------
+ Append (actual rows=N loops=N)
    InitPlan 1
      ->  Result (actual rows=N loops=N)
-   ->  Parallel Append (actual rows=N loops=N)
-         ->  Seq Scan on listp_12_1 listp_1 (actual rows=N loops=N)
-               Filter: (a = (InitPlan 1).col1)
-         ->  Parallel Seq Scan on listp_12_2 listp_2 (never executed)
-               Filter: (a = (InitPlan 1).col1)
-(10 rows)
+   ->  Seq Scan on listp_12_1 listp_1 (actual rows=N loops=N)
+         Filter: (a = (InitPlan 1).col1)
+   ->  Seq Scan on listp_12_2 listp_2 (never executed)
+         Filter: (a = (InitPlan 1).col1)
+(7 rows)
 
 -- Like the above but throw some more complexity at the planner by adding
 -- a UNION ALL.  We expect both sides of the union not to scan the
@@ -4177,27 +4174,24 @@
 'select * from listp where a = (select 1)
   union all
 select * from listp where a = (select 2);');
-                              explain_parallel_append                              
------------------------------------------------------------------------------------
- Gather (actual rows=N loops=N)
-   Workers Planned: 2
-   Workers Launched: N
-   ->  Parallel Append (actual rows=N loops=N)
-         ->  Parallel Append (actual rows=N loops=N)
-               InitPlan 2
-                 ->  Result (actual rows=N loops=N)
-               ->  Seq Scan on listp_12_1 listp_1 (never executed)
-                     Filter: (a = (InitPlan 2).col1)
-               ->  Parallel Seq Scan on listp_12_2 listp_2 (actual rows=N loops=N)
-                     Filter: (a = (InitPlan 2).col1)
-         ->  Parallel Append (actual rows=N loops=N)
-               InitPlan 1
-                 ->  Result (actual rows=N loops=N)
-               ->  Seq Scan on listp_12_1 listp_4 (actual rows=N loops=N)
-                     Filter: (a = (InitPlan 1).col1)
-               ->  Parallel Seq Scan on listp_12_2 listp_5 (never executed)
-                     Filter: (a = (InitPlan 1).col1)
-(18 rows)
+                      explain_parallel_append                       
+--------------------------------------------------------------------
+ Append (actual rows=N loops=N)
+   ->  Append (actual rows=N loops=N)
+         InitPlan 1
+           ->  Result (actual rows=N loops=N)
+         ->  Seq Scan on listp_12_1 listp_1 (actual rows=N loops=N)
+               Filter: (a = (InitPlan 1).col1)
+         ->  Seq Scan on listp_12_2 listp_2 (never executed)
+               Filter: (a = (InitPlan 1).col1)
+   ->  Append (actual rows=N loops=N)
+         InitPlan 2
+           ->  Result (actual rows=N loops=N)
+         ->  Seq Scan on listp_12_1 listp_4 (never executed)
+               Filter: (a = (InitPlan 2).col1)
+         ->  Seq Scan on listp_12_2 listp_5 (actual rows=N loops=N)
+               Filter: (a = (InitPlan 2).col1)
+(15 rows)
 
 drop table listp;
 reset parallel_tuple_cost;