AUTH_BYTES_INVALID on parallel download of files

[sadfun]

What version of gotd are you using?

github.com/gotd/td v0.80.0

Can this issue be reproduced with the latest version?

Yes

What did you do?

We have an application running multiple gotd clients with different accounts. When we try to download multiple files in parallel, using *downloader.Downloader and .Parallel(), it sometimes can throw this error:

get file: get next chunk: create connection to DC 2: transfer: import from 2: invoke pool: rpcDoRequest: rpc error code 400: AUTH_BYTES_INVALID

We tried 3 approaches:

1. Using one global downloader to download everything
2. Using one downloader per gotd client
3. Creating new downloader for each download

All of these approaches fails with the same error.

What did you expect to see?

Files downloading without errors.

What did you see instead?

get file: get next chunk: create connection to DC 2: transfer: import from 2: invoke pool: rpcDoRequest: rpc error code 400: AUTH_BYTES_INVALID