Preflight Checklist

• I have searched the issue tracker for an issue that matches the one I want to file, without success.
• I am not looking for support or already pursued the available support channels without success.
• I have checked the troubleshooting guide for my problem, without success.

Viper Version

1.15.0

Go Version

1.17.8

Config Source

Environment variables

Format

Other (specify below)

Repl.it link

No response

Code reproducing the issue

func main(){
        type C struct {
		HOME string `mapstructure:"HOME"`
	}

	c := C{}

	viper.AutomaticEnv()
	err := viper.Unmarshal(&c)
	if err != nil {
		panic(err)
	}
	fmt.Println(c.HOME)
	fmt.Println(viper.Get("HOME"))

}

Expected Behavior

I want to get the value of home from the structure
output:
/Users/cy
/Users/cy

Actual Behavior

output:

/Users/cy

Steps To Reproduce

computer:
macOS Catalina version: 10.15.7(19h15)
MacBook Pro (15-inch, 2018)

Additional Information

No response