WP_Query Multiple Relationships relation = AND doesn't work ?

Hi,

since yesterday I tried to make a WP_Query with 2 relationship with a AND relation.

Here is the content of the array of my query.

Array
(
    [post_type] => recipe
    [paged] => 1
    [posts_per_page] => 9
    [relationship] => Array
        (
            [0] => Array
                (
                    [id] => recipes_to_brands
                    [to] => 75
                )

            [1] => Array
                (
                    [id] => cheeses_to_recipes
                    [from] => 73
                )

            [relation] => AND
        )

)

With that, no result.

If I exclude one of the two relation, I have my result.

So with

Array
(
    [post_type] => recipe
    [paged] => 1
    [posts_per_page] => 9
    [relationship] => Array
        (
            [0] => Array
                (
                    [id] => recipes_to_brands
                    [to] => 75
                )

            [relation] => AND
        )

)

And

Array
(
    [post_type] => recipe
    [paged] => 1
    [posts_per_page] => 9
    [relationship] => Array
        (
            [0] => Array
                (
                    [id] => cheeses_to_recipes
                    [from] => 73
                )

            [relation] => AND
        )

)

I have each time the same post found.

If I replace AND by OR, my result is found but I don't want to use an OR 😉

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