Bug Description

This may be a misconfiguration issue, but at the moment if a file is uploaded with the same filename but the extension is jpeg or jpg, the corresponding webp file generated is overwritten by the last file uploaded.

Steps to reproduce

1. Create 2 files, for example, Paul-Test.jpeg and Paul-Test.jpg
2. Go to Media Gallery
3. Click on Add New
4. Upload Paul-Test.jpeg
5. Check ~/wp-content/uploads/2022/06/Paul-Test.jpeg
6. Check ~/wp-content/uploads/2022/06/Paul-Test.webp
7. Upload Paul-Test.jpg
8. Check ~/wp-content/uploads/2022/06/Paul-Test.jpg
9. Check ~/wp-content/uploads/2022/06/Paul-Test.webp
10. The file Paul-Test.webp created from Paul-Test.jpeg is overwritten with the webp generated from Paul-Test.jpg

Additional Context

I have added this to functions.php:

/* Image conversion attributes */
add_filter('webp_uploads_upload_image_mime_transforms', function () {

    return [
        'image/jpeg' =>  [ 'image/jpeg', 'image/webp' ],
        'image/png' =>  [ 'image/png', 'image/webp' ],
        'image/webp' =>  [ 'image/webp', 'image/jpeg' ],
    ];
});

• PHP Version: 7.4
• OS: RHEL 8.6
• Browser: Firefox
• Plugin Version: 1.1.0

To note, PNGs with the same filename do not overwrite the webp image (an image is not created at all).