Gorm Statement.Changed can't work on a new custom struct

GORM Playground Link

https://github.com/go-gorm/playground/pull/808

Description

When hook tx.Statement.Changed on func BeforeUpdate catch "age"

create a struct, and method.

func (m *Man) update(data interface{}) error {
    return DB.Set("data", data).Model(m).Where("id = ?", m.Id).Updates(data).Error
}

func (m *Man) BeforeUpdate(tx *gorm.DB) error {
    if !tx.Statement.Changed("age") {
        fmt.Println("no")
        return nil
    }
    fmt.Println("yes")
    return nil
}

this struct have Age, so tx.Statement.Changed("age") should got yes, but got panic: reflect: Field index out of range

    var change3 = struct {
        Age int
    }{Age: 30}

    // change3 -> panic: reflect: Field index out of range
    err := idx.update(change3)
    if err != nil {
        return
    }

at playground, just change1 and change2 got yes.