For a simple model with a self-referential many2many link (Depends) an Updates() does not remove associations.

It seems that a db.Model(self3).Association("Depends").Replace(self3.Depends) should be implicit in FullSaveAssociations

type Self struct {
    gorm.Model
    Name    string
    Depends []*Self `gorm:"many2many:self_depends"`
}

self3.Depends = []*Self{self1}
// saves with 1 insert into self_depends
db.Session(&gorm.Session{FullSaveAssociations: true}).Updates(self3) 

self3.Depends = []*Self{self1, self2}
// saves with 2 inserts into self_depends.
db.Session(&gorm.Session{FullSaveAssociations: true}).Updates(self3)

self3.Depends = []*Self{self1}
// saves with 1 insert into self_depends but no removals
db.Session(&gorm.Session{FullSaveAssociations: true}).Select("*", clause.Associations).Updates(self3) 

// at this point a read of self3 will show self3.Depends == []*Self{self1, self2}

Full minimal example

https://go.dev/play/p/KIC86xOJZVN or https://gist.github.com/lbt-bd/ec87648d0fe3d4b8bea3c3073eb087dd

The go-gorm/playground doesn't work on MacOS

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