Using the fields parameter in the photos?

Question

Classmates

Hello!
The photos.getPhotos method should return a fairly large set of fields, however, when it is executed, a much smaller set is returned:

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photos:[

    {
        type:group
        id:00000000000000000
        pic50x50:
        pic128x128
        pic640x480:
        text:
        album_id:
        comments_count:1
        like_count:0
        liked_it:false
        group_id:
        author_type:GROUP
        author_name:
    }

And if you add the photos.* parameter to the fields field, then it gives an error that the parameter is incorrect, if you add photo.*, then it gives an answer with an empty array. The same thing happens if you specify a specific parameter value. Actually interested in discussion_id. Tell me what could be the problem?
UPD
And photos.getInfo gives an empty array all the time (