Laravel mpdf background image "sometimes" not showing up

Hey, i'm using laravel mpdf package from;

https://github.com/mccarlosen/laravel-mpdf

I use in blade file something like;

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <style>
        body {
            font-family: 'timesnewroman';
        }

        @page {
            background-image: url("https://example.com/background.jpg") no-repeat 0 0;
            background-image-resize: 6;
        }
    </style>
</head>

I'm using this package for create certificates for courses. I had this problem before, when i create 2k certificates around 100 certificates didn't get a background image, so i just moved background image to another website/project and using from another url. The certificate count without background images decreased to around 5-10. When i recreate these certificates, background showing up.

I'm stuck right here, do you guys have any idea?

Regards.

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