diff --git a/contrib/test_decoding/Makefile b/contrib/test_decoding/Makefile
index c7ce603706..9b3389a90e 100644
--- a/contrib/test_decoding/Makefile
+++ b/contrib/test_decoding/Makefile
@@ -9,6 +9,7 @@ REGRESS = ddl xact rewrite toast permissions decoding_in_xact \
 ISOLATION = mxact delayed_startup ondisk_startup concurrent_ddl_dml \
 	oldest_xmin snapshot_transfer subxact_without_top concurrent_stream \
 	twophase_snapshot slot_creation_error catalog_change_snapshot
+ISOLATION = oldest_xmin oldest_xmin oldest_xmin
 
 REGRESS_OPTS = --temp-config $(top_srcdir)/contrib/test_decoding/logical.conf
 ISOLATION_OPTS = --temp-config $(top_srcdir)/contrib/test_decoding/logical.conf
diff --git a/src/backend/utils/activity/pgstat_shmem.c b/src/backend/utils/activity/pgstat_shmem.c
index 09fffd0e82..5307116670 100644
--- a/src/backend/utils/activity/pgstat_shmem.c
+++ b/src/backend/utils/activity/pgstat_shmem.c
@@ -551,6 +551,7 @@ pgstat_release_entry_ref(PgStat_HashKey key, PgStat_EntryRef *entry_ref,
 			/* only dropped entries can reach a 0 refcount */
 			Assert(entry_ref->shared_entry->dropped);
 
+pg_usleep(100000L);
 			shent = dshash_find(pgStatLocal.shared_hash,
 								&entry_ref->shared_entry->key,
 								true);