IssueTracker

This is the issue tracker for developers using the Google Photos Library API:  http://developers.google.com/photos

For issues with the Google Photos app, please see: https://support.google.com/photos/answer/6156065?hl=en

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# Description
Listing album items, never ends (after listing all existing photos, again same photos are listed)

# Detailed description
I was uploading photos to my album via API, at 125th photo server rethred 500: Internal error encountered.

After that my album cannot be reliably listed via API. Responses circle around same collection constantly. Additionally there are problems accessing the album on website. I can open it, yet when I try to operate on any options suddenly page hanges


## API calls

Calling `https://photoslibrary.googleapis.com/v1/mediaItems:search` with `{ albumId, pageSize: 100, pageToken: nextPageToken }` circles around same collection constantly (I can provide album id if needed)

This album normally has 5482 items, yet above API endpoint after listing all those files again starts returning same field, and so on. I've managed to  407400 items until at some point next request failed

## Steps to reproduce the problem

What steps will reproduce the problem?

1. Attempt to retrieve all album media items via: "https://photoslibrary.googleapis.com/v1/mediaItems:search`

I reproduce it only on this single album, I can provide its id if needed

## What is the expected output?

I want to receive the whole album media list with not repeated items.

## What do you see instead?  
Command returns new items all the times, and nextPageToken is provided for all the following pages

## Code sample
A small code sample that reliably reproduces the issue. The sample should run as-is or with minimal setup.

```javascript
const getPhotos = async (auth, albumId, pageToken = null, count = 0) => {
        const url = "https://photoslibrary.googleapis.com/v1/mediaItems:search";
        const response = await fetch(url, {
                method: "POST",
                headers: { Authorization: `Bearer ${ auth.credentials.access_token }` },
                body: JSON.stringify({ albumId, pageSize: 100, pageToken: pageToken || undefined })
        });
        if (response.status !== 200) throw new Error(await response.text());
        const data = await response.json();
        if (data.nextPageToken) {
                return [
                        ...data.mediaItems, ...(await getPhotos(auth, albumId, data.nextPageToken, count + 1))
                ];
        }
        return data.mediaItems || [];
};
getPhotos(auth, albumId);
```