diff --git a/packages/core/src/entity/EntityFactory.ts b/packages/core/src/entity/EntityFactory.ts
index 5796bb04eb56..23c8e2622c52 100644
--- a/packages/core/src/entity/EntityFactory.ts
+++ b/packages/core/src/entity/EntityFactory.ts
@@ -384,7 +384,19 @@ export class EntityFactory {
       }
 
       if (!meta.properties[k]) {
-        return data;
+        const tmp = { ...data };
+
+        for (const prop of meta.props) {
+          if (prop.customType && tmp[prop.name] != null) {
+            tmp[prop.name] = prop.customType.convertToJSValue(tmp[prop.name], this.platform) as any;
+          }
+        }
+
+        return tmp;
+      }
+
+      if (meta.properties[k].customType && data[k] != null) {
+        return meta.properties[k].customType!.convertToJSValue(data[k], this.platform);
       }
 
       return data[k];
diff --git a/packages/core/src/utils/Utils.ts b/packages/core/src/utils/Utils.ts
index 60dd4ad01c72..b772a6e458fb 100644
--- a/packages/core/src/utils/Utils.ts
+++ b/packages/core/src/utils/Utils.ts
@@ -480,7 +480,7 @@ export class Utils {
 
       if (inside === 2 && token.type === 'Punctuator' && token.value === '{') {
         ret.push(ObjectBindingPattern as unknown as string);
-        i += 2;
+        i = tokens.findIndex((t, idx) => idx > i + 2 && t.type === 'Punctuator' && t.value === '}');
         continue;
       }
 
diff --git a/tests/features/custom-types/GH5118.test.ts b/tests/features/custom-types/GH5118.test.ts
new file mode 100644
index 000000000000..75bea11f3421
--- /dev/null
+++ b/tests/features/custom-types/GH5118.test.ts
@@ -0,0 +1,95 @@
+import { Entity, MikroORM, PrimaryKey, Property, Type } from '@mikro-orm/sqlite';
+
+class Value {
+
+  protected readonly value: string;
+
+  toString() {
+    return this.value;
+  }
+
+  constructor(id: string) {
+    this.value = id;
+  }
+
+}
+
+class SimpleType extends Type<
+  Value | undefined,
+  string | undefined
+> {
+
+  constructor(private classRef: new (value: any) => Value) {
+    super();
+  }
+
+  convertToDatabaseValue(
+    value: Value | string | null | undefined,
+  ): string | undefined {
+    if (!value) {
+      return undefined;
+    }
+    if (typeof value === 'string') {
+      return value;
+    }
+    return value.toString();
+  }
+
+  convertToJSValue(
+    value: Value | string | undefined,
+  ): Value | undefined {
+    if (!value) {
+      return undefined;
+    }
+    return new this.classRef(
+      typeof value === 'object' ? value.toString() : value,
+    );
+  }
+
+}
+
+@Entity()
+class File {
+
+  @PrimaryKey({ type: new SimpleType(Value) })
+  readonly id: Value;
+
+  @Property({ type: new SimpleType(Value) })
+  readonly uri: Value;
+
+  constructor({ id, uri }: { id: Value; uri: Value }) {
+    this.id = id;
+    this.uri = uri;
+  }
+
+}
+
+let orm: MikroORM;
+
+beforeAll(async () => {
+  orm = await MikroORM.init({
+    forceEntityConstructor: true,
+    entities: [File],
+    dbName: ':memory:',
+  });
+  await orm.schema.createSchema();
+});
+
+afterAll(async () => {
+  await orm.close(true);
+});
+
+test(`custom types and forceEntityConstructor`, async () => {
+  await orm.em.fork().persistAndFlush(
+    new File({
+      id: new Value('foo'),
+      uri: new Value('bar'),
+    }),
+  );
+
+  const retrieved = await orm.em.findOneOrFail(File, {
+    id: new Value('foo'),
+  });
+  expect(retrieved.id).toBeInstanceOf(Value);
+  expect(retrieved.uri).toBeInstanceOf(Value);
+});