date_query empty results with custom post type

Assuming that you’re trying to get all posts in the first half of 2022, as opposed to the first 6 days of 2022, then you need to be clearer with your before and after dates.

date_query uses strtotime behind the scenes, which will interpret your dates as Jan 1 to Jan 6. You need to either change the dates to the American format of YYYY-DD-MM, or be more specific by using arrays to express your dates instead.