Hello Gonzalo,
Thank you for reaching out, and I apologize for the inconvenience you are experiencing.
To resolve the issue, please ensure the following PHP extensions are enabled in your XAMPP environment:
extension=gd
extension=imagick
These extensions are required for proper handling of WebP images. After enabling them, don't forget to restart Apache in your XAMPP control panel for the changes to take effect.
If the issue persists, please let me know, and I will be happy to assist you further.
Best regards