[Spec Resync] 01-19-2026 (mongodb#2680)

Co-authored-by: Cloud User <ec2-user@ip-10-128-52-183.ec2.internal>

Author: mongodb-drivers-pr-bot[bot]

test/handshake/unified/metadata-not-propagated.json

@@ -10,6 +10,7 @@
     {
       "client": {
         "id": "client",
+        "useMultipleMongoses": false,
         "observeEvents": [
           "commandSucceededEvent",
           "commandFailedEvent",