diff --git a/packages/core/src/entity/EntityFactory.ts b/packages/core/src/entity/EntityFactory.ts
index effb7ffa5b91..0f40dab3c4fa 100644
--- a/packages/core/src/entity/EntityFactory.ts
+++ b/packages/core/src/entity/EntityFactory.ts
@@ -1,8 +1,8 @@
-import { ObjectBindingPattern, Utils } from '../utils';
+import { Utils } from '../utils';
 import { Dictionary, EntityData, EntityMetadata, EntityName, EntityProperty, New, Populate, Primary } from '../typings';
 import { UnitOfWork } from '../unit-of-work';
 import { ReferenceType } from './enums';
-import { EntityManager, EventType, wrap } from '..';
+import { EntityManager, EventType } from '..';
 
 export const SCALAR_TYPES = ['string', 'number', 'boolean', 'Date', 'Buffer', 'RegExp'];
 
@@ -138,7 +138,7 @@ export class EntityFactory {
         return this.createReference(meta.properties[k].type, data[k]);
       }
 
-      if (!(k in data) || k as unknown === ObjectBindingPattern) {
+      if (!meta.properties[k]) {
         return data;
       }
 
diff --git a/packages/knex/src/query/QueryBuilder.ts b/packages/knex/src/query/QueryBuilder.ts
index 3e2b40ecc969..027255b21ce9 100644
--- a/packages/knex/src/query/QueryBuilder.ts
+++ b/packages/knex/src/query/QueryBuilder.ts
@@ -251,7 +251,7 @@ export class QueryBuilder<T extends AnyEntity<T> = AnyEntity> {
   }
 
   getAliasForJoinPath(path: string): string | undefined {
-    if (path === this.entityName) {
+    if (!path || path === this.entityName) {
       return this.alias;
     }
 
diff --git a/tests/QueryBuilder.test.ts b/tests/QueryBuilder.test.ts
index fbee299889ce..bd87ba092e16 100644
--- a/tests/QueryBuilder.test.ts
+++ b/tests/QueryBuilder.test.ts
@@ -1410,6 +1410,34 @@ describe('QueryBuilder', () => {
     expect(qb.getQuery()).toEqual('select `e0`.* from `publisher2` as `e0` order by length(name) desc, `e0`.`type` asc');
   });
 
+  test('GH issue 786', async () => {
+    const qb1 = orm.em.createQueryBuilder(Book2);
+    qb1.select('*').where({
+      $and: [
+        { uuid: { $ne: '...' }, createdAt: { $gt: '2020-08-26T20:01:48.863Z' } },
+        { tags: { name: { $in: ['tag1'] } } },
+      ],
+    });
+    expect(qb1.getQuery()).toEqual('select `e0`.*, `e0`.price * 1.19 as `price_taxed` ' +
+      'from `book2` as `e0` ' +
+      'left join `book2_tags` as `e2` on `e0`.`uuid_pk` = `e2`.`book2_uuid_pk` ' +
+      'left join `book_tag2` as `e1` on `e2`.`book_tag2_id` = `e1`.`id` ' +
+      'where `e0`.`uuid_pk` != ? and `e0`.`created_at` > ? and `e1`.`name` in (?)');
+
+    const qb2 = orm.em.createQueryBuilder(Book2);
+    qb2.select('*').where({
+      $and: [
+        { tags: { name: { $in: ['tag1'] } } },
+        { uuid: { $ne: '...' }, createdAt: { $gt: '2020-08-26T20:01:48.863Z' } },
+      ],
+    });
+    expect(qb2.getQuery()).toEqual('select `e0`.*, `e0`.price * 1.19 as `price_taxed` ' +
+      'from `book2` as `e0` ' +
+      'left join `book2_tags` as `e2` on `e0`.`uuid_pk` = `e2`.`book2_uuid_pk` ' +
+      'left join `book_tag2` as `e1` on `e2`.`book_tag2_id` = `e1`.`id` ' +
+      'where `e1`.`name` in (?) and `e0`.`uuid_pk` != ? and `e0`.`created_at` > ?');
+  });
+
   test('pg array operators', async () => {
     const pg = await MikroORM.init<PostgreSqlDriver>({
       entities: [Author2, Address2, Book2, BookTag2, Publisher2, Test2, BaseEntity2, Configuration2],