1 files changed, 5 insertions, 0 deletions
diff --git a/synapse/events/utils.py b/synapse/events/utils.py
index 32c73d3413..355cbe05f1 100644
--- a/synapse/events/utils.py
+++ b/synapse/events/utils.py
@@ -49,6 +49,11 @@ def prune_event(event: EventBase) -> EventBase:
         pruned_event_dict, event.room_version, event.internal_metadata.get_dict()
     )
 
+    # copy the internal fields
+    pruned_event.internal_metadata.stream_ordering = (
+        event.internal_metadata.stream_ordering
+    )
+
     # Mark the event as redacted
     pruned_event.internal_metadata.redacted = True