diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index 89cf9f9389c..34ca52d6cc0 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -1029,7 +1029,6 @@ ReorderBufferAssignChild(ReorderBuffer *rb, TransactionId xid,
 	bool		new_top;
 	bool		new_sub;
 
-	txn = ReorderBufferTXNByXid(rb, xid, true, &new_top, lsn, true);
 	subtxn = ReorderBufferTXNByXid(rb, subxid, true, &new_sub, lsn, false);
 
 	if (!new_sub)
@@ -1054,6 +1053,8 @@ ReorderBufferAssignChild(ReorderBuffer *rb, TransactionId xid,
 	subtxn->toplevel_xid = xid;
 	Assert(subtxn->nsubtxns == 0);
 
+	txn = ReorderBufferTXNByXid(rb, xid, true, &new_top, lsn, true);
+
 	/* set the reference to top-level transaction */
 	subtxn->toptxn = txn;
 
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index bf72ad45ec7..00428e46d09 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -808,6 +808,10 @@ SnapBuildProcessNewCid(SnapBuild *builder, TransactionId xid,
 {
 	CommandId	cid;
 
+	/* we have a top XID, but it's not known to be subxact */
+	if (xid != xlrec->top_xid && xlrec->top_xid != InvalidTransactionId)
+		ReorderBufferAssignChild(builder->reorder, xlrec->top_xid, xid, lsn);
+
 	/*
 	 * we only log new_cid's if a catalog tuple was modified, so mark the
 	 * transaction as containing catalog modifications