User profile photo is not updated

[BUITUANLINH20183784]

Here's my situation: a user in a basicGroup chat that I'm also in has changed his profile photo. On the Telegram official app his profile photo in the chat is shown correctly. But in my app using tdlib, getUserProfilePhotos always return empty

%{
  "@client_id" => 12,
  "@type" => "chatPhotos",
  "photos" => [],
  "total_count" => 0
}

getUser and getUserFullInfo also give no profile photo. Here's the output of getUser:

%{
  "@client_id" => 12,
  "@type" => "user",
  "accent_color_id" => 0,
  "added_to_attachment_menu" => false,
  "background_custom_emoji_id" => "0",
  "emoji_status" => %{
    "@type" => "emojiStatus",
    "custom_emoji_id" => "********",
    "expiration_date" => 0
  },
  "first_name" => "********",
  "has_active_stories" => false,
  "has_unread_active_stories" => false,
  "have_access" => true,
  "id" => ********,
  "is_close_friend" => false,
  "is_contact" => false,
  "is_fake" => false,
  "is_mutual_contact" => false,
  "is_premium" => true,
  "is_scam" => false,
  "is_support" => false,
  "is_verified" => false,
  "language_code" => "",
  "last_name" => "",
  "phone_number" => "",
  "profile_accent_color_id" => -1,
  "profile_background_custom_emoji_id" => "0",
  "restriction_reason" => "",
  "restricts_new_chats" => false,
  "status" => %{
    "@type" => "userStatusRecently",
    "by_my_privacy_settings" => false
  },
  "type" => %{"@type" => "userTypeRegular"}
}

And getUserFullInfo:

%{
  "@client_id" => 12,
  "@type" => "userFullInfo",
  "bio" => %{"@type" => "formattedText", "entities" => [], "text" => ""},
  "can_be_called" => false,
  "group_in_common_count" => 4,
  "has_pinned_stories" => false,
  "has_private_calls" => true,
  "has_private_forwards" => true,
  "has_restricted_voice_and_video_note_messages" => true,
  "need_phone_number_privacy_exception" => false,
  "personal_chat_id" => 0,
  "premium_gift_options" => [],
  "set_chat_background" => false,
  "supports_video_calls" => false
}

I was wondering if this has anything to do with user cache in tdlib database? I do have use_chat_info_database option enabled.

[levlam]

If even after getUserFullInfo you receive no updateUserFullInfo with photos, then the user has no photo, or it isn't available to you because of privacy settings.