diff --git a/lib/shared/thread-utils.js b/lib/shared/thread-utils.js
--- a/lib/shared/thread-utils.js
+++ b/lib/shared/thread-utils.js
@@ -1198,6 +1198,7 @@
           baseThreadInfo.type,
           baseThreadInfo.members.map(member => member.id),
           sourceMessageID,
+          threadSpecs[baseThreadInfo.type].protocol().protocolName,
         );
       }
       const realizedThreadID = pendingToRealizedThreadIDs.get(pendingThreadID);