Gorm AutoMigrate not creating constraints properly

I'm running AutoMigrate on this model but it is not working properly:

type BrandMemoryContent struct {
    gorm.Model

    Content string `gorm:"not null" json:"content"`

    // FKs
    BrandID uint   `gorm:"not null;index:idx_brand_memory_brand,unique;" json:"-"`
    Brand   *Brand `json:"-" gorm:"foreignKey:BrandID;constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`

    LastEditedBy sql.NullInt32 `json:"-"`
    User         *User         `json:"last_editor" gorm:"foreignKey:LastEditedBy;constraint:OnUpdate:CASCADE,OnDelete:SET NULL;"`

    BrandMemoryID uint         `gorm:"not null;index:idx_brand_memory_brand,unique;" json:"-"`
    BrandMemory   *BrandMemory `json:"-" gorm:"foreignKey:BrandMemoryID;constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`
}

The problem is that it does not add "ON UPDATE CASCADE" and "ON DELETE CASCADE" to brand_id FOREIGN KEY. For the other two foreign keys (brand_id and last_edited_by) it works properly.

All needed models are migrated before BrandMemoryContent, including BrandMemory.

Am I doing something wrong?

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