Serializing struct with embedded interface results in malformed json

[ty-sentio-xyz]

Example:

type I interface {
	Foo()
}

type A struct {
	I
	Val string
}

func TestStructWithEmbeddedInterface(t *testing.T) {
	var s A
	s.Val = "456"

	j1, _ := json.Marshal(s)  // This uses encoding/json.
	fmt.Println("expected", string(j1))

	j2, _ := goccyjson.Marshal(s)  // This uses this library.
	fmt.Println("actual", string(j2))
}

The code above will generate a json string that is not valid.

Expected result (using encoding/json):
{"I":null,"Val":"456"}

Actual result:
{null,"Val":"456"}

This can be reproduced with:
github.com/goccy/go-json v0.10.0