Info

> db.foo.insert({_id: 2}) > db.runCommand({update: "foo", updates: [{q: {_id: 2}, u: [{$replaceWith: {$literal: {_id:2, $v: 2}}}]}]}) … does this in the (global) change stream: { _id: { _data: '8268D33CF7000000012B042C0100296E5A10043BA8D84899464C078E0C29EE953D547C463C6F7065726174696F6E54797065003C696E736572740046646F63756D656E744B657900461E5F6964002B04000004' }, operationType: 'insert', clusterTime: Timestamp({ t: 1758674167, i: 1 }), wallTime: ISODate('2025-09-24T00:36:07.146Z'), fullDocument: { _id: 2 }, ns: { db: 'test', coll: 'foo' }, documentKey: { _id: 2 } } MongoServerError[Location40532]: Executor error during getMore :: caused by :: Entry field "o.diff" should be object, found: missing The server should simply show the `replace` event.

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Steps to Reproduce

1. Open a change stream. (global, db, or collection) 2. Insert a document. 3. Replace that document with a version of itself with $v: 2 as a top-level field. 4. Iterate the change stream. You’ll eventually see the getMore error.