Gorm Update Query inconsistency

I am having an issue with my structs not being able to update values for foreign keys with GORM. When I use the Save method to update the AccountStatusID the value is not updated but it does work when I use the Updates method. At the same time the Save method works when I want to update the Name field.

I am using GORM version x.x.x.

Structs:

type User struct {
    gorm.Model
    Name            string
    AccountStatusID uint
    AccountStatus   AccountStatus `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;"`
}

type AccountStatus struct {
    gorm.Model
    Name string `gorm:"unique"`
}

Example code for the failing update:

userM.AccountStatusID = 2
result := r.DB.Save(&userM)

Example code for the successful update:

result := r.DB.Model(&userM).Updates(models.User{AccountStatusID: 2})

At the same time this works

userM.Name = "John"
result := r.DB.Save(&userM)

But this doesn't

result := r.DB.Model(&userM).Updates(models.User{Name: "John"})

## Updated Queries Related Docs

Am I missing something? Or Is this the expected behaviour?

Comment From: saeidee

I can reproduce the issue, please create a playground PR here: https://github.com/go-gorm/playground