diff --git a/configs/fb50_all.conf b/configs/fb50_all.conf
index 850fcda1..fa264e6b 100644
--- a/configs/fb50_all.conf
+++ b/configs/fb50_all.conf
@@ -78,8 +78,8 @@ ClientBatchBuffer = 131072
 SnapshotsMemSize = 64K
 TipCacheBlockSize = 4M
 
-# Added 03-apr-2023:
-ParallelWorkers = 1
+# ParallelWorkers must be GREATER than 1 since 28.09.2024, see bugs/gh_8263_test.py 
+ParallelWorkers = 2
 MaxParallelWorkers = 8
 
 # SubQueryConversion = false
diff --git a/configs/fb60_all.conf b/configs/fb60_all.conf
index 679b1edd..4519f757 100644
--- a/configs/fb60_all.conf
+++ b/configs/fb60_all.conf
@@ -78,8 +78,8 @@ ClientBatchBuffer = 131072
 SnapshotsMemSize = 64K
 TipCacheBlockSize = 4M
 
-# Added 03-apr-2023:
-ParallelWorkers = 1
+# ParallelWorkers must be GREATER than 1 since 28.09.2024, see bugs/gh_8263_test.py 
+ParallelWorkers = 2
 MaxParallelWorkers = 8
 
 #OptimizeForFirstRows = false