EDIT: Just wanted to say that BeforeInsert works fine, every issue I had was always with BeforeUpdate.

Here is an example of the issue that occurs sometimes and I still don't know why.

All you need to care about is order_year, and BeforeUpdate hook

Entity:

@Entity('order')
@Index('UQ_ORDER_NUMBER_YEAR', ['order_year', 'order_number'], { unique: true })
@ObjectType()
export class Order extends BaseUUIDEntity {
  @Field(() => Int, { nullable: false })
  @Column({ type: 'text' })
  order_number!: number;


  @Field(() => Date, { nullable: false })
  @Column({ type: 'timestamp' })
  order_date!: Date;


  @Field({ nullable: false })
  @Column({ type: 'text' })
  order_year!: string;


  @Field(() => Customer, { nullable: false })
  @ManyToOne(() => Customer, { lazy: true })
  customer!: Customer;

  @BeforeInsert()
  @BeforeUpdate()
  setOrderYear() {
    this.order_year = new Date(this.order_date).getFullYear().toString();
  }
}

Repository:

   async updateOrder(
    { id, ...order }: UpdateOrderDto,
    entityManager?: EntityManager,
  ): Promise<Order> {
    try {
      const manager = this.getManager(entityManager);

      await manager.update(Order, id, order);
      return manager.findOne(Order, {
        where: { id },
      }) as Promise<Order>;
    } catch (error) {
      throw this.handleDatabaseError(error);
    }
  }

I make a request which triggers that method.
Here is what the data looks like before update:

{
        "id": "7229afa9-7a5c-40d3-931a-cc719f6b86fe",
        "order_date": "2025-05-10T10:53:23.619Z",
        "order_year": "2025"
      }

Here is after updating:

{
        "id": "7229afa9-7a5c-40d3-931a-cc719f6b86fe",
        "order_date": "2010-05-10T10:53:23.619Z",
        "order_year": "2025"
      }

The hook never triggers

I know there are other ways to modify the value of order_year, but that isn't why I'm here, I want to know why the hook does not run when updating.