Problem with gif size since 3.17.0

Description:

Since 3.17.0, gifs uploaded via giphy have their size stretched, as you can see:

If I add this gif or any image via the "plus"button, it works correctly.

This problem also occured with a custom integration with the following script:

process_outgoing_response({ request, response }) {
        let gif = '';
        if(response.content.data.length !== 0) {
            if(Array.isArray(response.content.data)) {
                const count = response.content.data.length - 1;
                const i = Math.floor((Math.random() * Math.min(count, config.range) ));
                gif = response.content.data[i].images.original.url;
            } else {
                gif = response.content.data.image_original_url;
            }
            return {
                content: {
                    attachments: [
                        {
                            title: "Gify",
                            image_url: gif,
                            color: ((config['color'] != '') ? '#' + config['color'].replace('#', '') : '#225159')
                        }
                    ]
                }
            };
...

Thanks for your help.

Start by reproducing the stretched GIF with a Giphy attachment and compare it with an image inserted through the plus button. Trace the attachment data returned by process_outgoing_response, especially image_url, through the message display path. Done means both integration and manually added GIFs preserve their intended dimensions.