with helper not working when this refers to a struct

[nektro]

html:

{{#with (lookup mymap 'key')}}
<p>0: {{this}}</p>
<p>1: {{ID}}</p>
<p>2: {{this.ID}}</p>
{{/with}}

context:

type MyStruct struct {
	ID string `json:"id"`
}
ctx := map[string]interface{}{
	"mymap": map[string]MyStruct{
		"key": MyStruct{
			ID: "42",
		},
	},
}

expected result:

<p>0: {42}</p>
<p>1: 42</p>
<p>2: 42</p>

actual result:

<p>0: {42}</p>
<p>1: </p>
<p>2: </p>