diff --git a/server/mongo/src/storage.ts b/server/mongo/src/storage.ts
index 51f701e58f..98b8016049 100644
--- a/server/mongo/src/storage.ts
+++ b/server/mongo/src/storage.ts
@@ -240,10 +240,20 @@ abstract class MongoAdapterBase extends TxProcessor {
     for (const row of result) {
       row.$lookup = {}
       await this.fillLookupValue(options.lookup, row)
+      this.clearExtraLookups(row)
     }
     return result
   }
 
+  private clearExtraLookups (row: any): void {
+    for (const key in row) {
+      if (key.endsWith('_lookup')) {
+        // eslint-disable-next-line
+        delete row[key]
+      }
+    }
+  }
+
   private checkMixinKey<T extends Doc>(key: string, clazz: Ref<Class<T>>): string {
     if (!key.includes('.')) {
       try {