mobx-react-form: Wrong deep field path for initField() on update()

if i have a form that is defined

// this was edited to correct a typo. was originally "const rules"
const fields =[
	'name',
	'list.cat1',
	'list.cat1[].name',
	'list.cat1[].url',
	'list.cat2',
	'list.cat2[].name',
	'list.cat2[].url',
]

is it correct for me to define the rules like:

const rules = {
	'name': 'string|required|between:1,255',
	'list.cat1[].url' : 'url|required',
	'list.cat2[].url' : 'url|required',
}

when i attempt to validate the form, it appears that the nested fields are not getting validated. i.e. list.cat1[].url and list.cat2[].url