Carbon formatLocalized not working giving incorrect JSON

I am converting time to french date time using formatLocalized but it sometimes gives strange JSON character. Sometimes it works fine and some times it doesnt.

this is what i am calling

dd($date->copy()->modify($time)->setTimezone($input['timezone'])->formatLocalized('%A, %B %d'));

and this is what i am getting in response

b"mercredi, août 30"

the correct response will be wituouth "b"

Am i doing something wrong ?

via Chebli Mohamed