diff -U3 /tmp/cirrus-ci-build/src/test/regress/expected/guc.out /tmp/cirrus-ci-build/build/testrun/pg_upgrade/002_pg_upgrade/data/results/guc.out
--- /tmp/cirrus-ci-build/src/test/regress/expected/guc.out	2024-03-10 16:14:39.486212000 +0000
+++ /tmp/cirrus-ci-build/build/testrun/pg_upgrade/002_pg_upgrade/data/results/guc.out	2024-03-10 16:16:27.034859000 +0000
@@ -849,9 +849,10 @@
 SELECT name FROM tab_settings_flags
   WHERE category = 'Developer Options' AND NOT not_in_sample
   ORDER BY 1;
- name 
-------
-(0 rows)
+             name              
+-------------------------------
+ backtrace_functions_min_level
+(1 row)
 
 -- Most query-tuning GUCs are flagged as valid for EXPLAIN.
 -- default_statistics_target is an exception.