diff --git a/go/vt/vtgate/planbuilder/testdata/dml_cases.json b/go/vt/vtgate/planbuilder/testdata/dml_cases.json
index 60f844ed05c..469a75f203e 100644
--- a/go/vt/vtgate/planbuilder/testdata/dml_cases.json
+++ b/go/vt/vtgate/planbuilder/testdata/dml_cases.json
@@ -3031,7 +3031,22 @@
         "TableName": "user_privacy_consents"
       }
     },
-    "gen4-plan": "unsupported: unable to split predicates to derived table: not :__sq_has_values1"
+    "gen4-plan": {
+      "QueryType": "INSERT",
+      "Original": "INSERT INTO main.user_privacy_consents (user_id, accepted_at)  SELECT user_id, accepted_at FROM (SELECT 1 as user_id, 1629194864 as accepted_at) AS tmp WHERE NOT EXISTS (SELECT user_id FROM main.user_privacy_consents WHERE user_id = 1)",
+      "Instructions": {
+        "OperatorType": "Insert",
+        "Variant": "Unsharded",
+        "Keyspace": {
+          "Name": "main",
+          "Sharded": false
+        },
+        "TargetTabletType": "PRIMARY",
+        "MultiShardAutocommit": false,
+        "Query": "insert into user_privacy_consents(user_id, accepted_at) select user_id, accepted_at from (select 1 as user_id, 1629194864 as accepted_at from dual) as tmp where not exists (select 1 from user_privacy_consents where user_id = 1 limit 1) for update",
+        "TableName": "user_privacy_consents"
+      }
+    }
   },
   {
     "comment": "Delete on backfilling unique lookup vindex should be a scatter",
diff --git a/go/vt/vtgate/planbuilder/testdata/select_cases.json b/go/vt/vtgate/planbuilder/testdata/select_cases.json
index eee9dda7dc9..667f974a1c7 100644
--- a/go/vt/vtgate/planbuilder/testdata/select_cases.json
+++ b/go/vt/vtgate/planbuilder/testdata/select_cases.json
@@ -5479,5 +5479,39 @@
         "Vindex": "user_index"
       }
     }
+  },
+  {
+    "comment": "query with a derived table and dual table in unsharded keyspace",
+    "query": "SELECT * FROM unsharded_a AS t1  JOIN (SELECT trim((SELECT MAX(name) FROM unsharded_a)) AS name) AS t2 WHERE t1.name >= t2.name ORDER BY t1.name ASC LIMIT 1;",
+    "v3-plan": {
+      "QueryType": "SELECT",
+      "Original": "SELECT * FROM unsharded_a AS t1  JOIN (SELECT trim((SELECT MAX(name) FROM unsharded_a)) AS name) AS t2 WHERE t1.name >= t2.name ORDER BY t1.name ASC LIMIT 1;",
+      "Instructions": {
+        "OperatorType": "Route",
+        "Variant": "Unsharded",
+        "Keyspace": {
+          "Name": "main",
+          "Sharded": false
+        },
+        "FieldQuery": "select * from unsharded_a as t1 join (select trim((select MAX(`name`) from unsharded_a where 1 != 1)) as `name` from dual where 1 != 1) as t2 where 1 != 1",
+        "Query": "select * from unsharded_a as t1 join (select trim((select MAX(`name`) from unsharded_a)) as `name` from dual) as t2 where t1.`name` >= t2.`name` order by t1.`name` asc limit 1",
+        "Table": "unsharded_a, dual"
+      }
+    },
+    "gen4-plan": {
+      "QueryType": "SELECT",
+      "Original": "SELECT * FROM unsharded_a AS t1  JOIN (SELECT trim((SELECT MAX(name) FROM unsharded_a)) AS name) AS t2 WHERE t1.name >= t2.name ORDER BY t1.name ASC LIMIT 1;",
+      "Instructions": {
+        "OperatorType": "Route",
+        "Variant": "Unsharded",
+        "Keyspace": {
+          "Name": "main",
+          "Sharded": false
+        },
+        "FieldQuery": "select * from unsharded_a as t1 join (select trim((select MAX(`name`) from unsharded_a where 1 != 1)) as `name` from dual where 1 != 1) as t2 where 1 != 1",
+        "Query": "select * from unsharded_a as t1 join (select trim((select MAX(`name`) from unsharded_a)) as `name` from dual) as t2 where t1.`name` >= t2.`name` order by t1.`name` asc limit 1",
+        "Table": "dual, unsharded_a"
+      }
+    }
   }
 ]
diff --git a/go/vt/vtgate/semantics/semantic_state.go b/go/vt/vtgate/semantics/semantic_state.go
index 4fe0ce75371..72e0835ad12 100644
--- a/go/vt/vtgate/semantics/semantic_state.go
+++ b/go/vt/vtgate/semantics/semantic_state.go
@@ -370,7 +370,8 @@ func (st *SemTable) SingleUnshardedKeyspace() *vindexes.Keyspace {
 	var ks *vindexes.Keyspace
 	for _, table := range st.Tables {
 		vindexTable := table.GetVindexTable()
-		if vindexTable == nil || vindexTable.Type != "" {
+
+		if vindexTable == nil {
 			_, isDT := table.getExpr().Expr.(*sqlparser.DerivedTable)
 			if isDT {
 				// derived tables are ok, as long as all real tables are from the same unsharded keyspace
@@ -379,6 +380,13 @@ func (st *SemTable) SingleUnshardedKeyspace() *vindexes.Keyspace {
 			}
 			return nil
 		}
+		if vindexTable.Type != "" {
+			// A reference table is not an issue when seeing if a query is going to an unsharded keyspace
+			if vindexTable.Type == vindexes.TypeReference {
+				continue
+			}
+			return nil
+		}
 		name, ok := table.getExpr().Expr.(sqlparser.TableName)
 		if !ok {
 			return nil