Writes empty files when using sink

[shadowhand]

Whenever I use this middleware when combined with the sink option empty files are written:

$client->get($uri, ['sink' => "$dir/$uri"]);

The file $dir/$uri is created but has no content.

[Kevinrob]

Are you sure that this is this middleware that cause the issue?
The sink option is handled before this middleware.

Can you share/post your code?

[shadowhand]

Yes, I've confirmed that sink works correctly when this middleware is disabled.

Guzzle config is here and here is our calling code, which is currently not using sink due to this issue.

[samwilson]

We're also seeing this issue in this project. The workaround of not using sink (and instead writing the response body out to a file after the Guzzle request) seems to work fine.