This happens when the image is not found. When using the command, make sure the image ends with an extension such as .png or .jpg and that the link does not exceed the maximum allowed characters in chat.
You can upload to imgur if the url is too long.
Not seeing any issues on our end. If this is still an issue please reply to this bug report and include the server name and region you're having this issue on.
We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.