Updating only updatedAt on a model does not cause an update, even with silent: true

[jamelling]

What are you doing?

person = Person.create({ name: 'Original Name'})
await Person.update({ updatedAt: new Date('02-26-1991')}, {where: { id: person.id }, silent: true})
// [ 0 ]

await person.reload()
await person.updatedAt
// 2019-04-12T20:13:52.923Z

await Person.update({ updatedAt: new Date('02-26-1991'), name: 'A New Name'}, {where: { id: person.id }, silent: true})
Executing (default): UPDATE "Person" SET "updatedAt"=$1,"name"=$2 WHERE "id" = $3
// [ 1 ]

await person.reload()
person.updatedAt
// 1991-02-26T05:00:00.000Z

To Reproduce
Steps to reproduce the behavior:

1. Create a model Person and an instance person
2. Use Person.update to update only the updatedAt field on person
3. Reload person to see that updatedAt has not been updated

What do you expect to happen?

I expected updatedAt to be updated,

What is actually happening?

updatedAt was not updated

Environment

Dialect:

• mysql
• postgres
• sqlite
• mssql
• any
  Dialect library version: XXX
  Database version: PostgreSQL 9.6
  Sequelize version: 5.10.0
  Node Version: 10.15.3
  OS: Ubuntu 18.04.1 on Windows 10
  Tested with latest release:
• No
• Yes, specify that version: 5.10.0

[papb]

What is the use case for updating only the updatedAt field?

[jamelling]

I only use it while doing tests for some filtering of data by updatedAt times.

I think it was introduced as a side effect of #10248, which was to prevent updating the updatedAt time when Model.update({ }, { where: { id: someId } }) was called, as this used to behave like I expect it to.

[Ladvace]

I have the same problem

[wangzhilongh]

I have the same problem

[papb]

Duplicate of #3759