Adguard detects website as false positive if the common name is not wildcard, how to resolve this issue?

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Assume a website whose Common Name of SSL certificate is this

myonlinebank.example.com

Assume a website whose Common Name of SSL certificate is this

*.example.com

Users are using adguard dns.

dns.adguard.com

And when they try to access the first site(the one without wildcard certificate), they get this error:

NET::ERR_CERT_COMMON_NAME_INVALID

Why? And what are the potential clever solutions(by using nginx config or otherwise) of this issue except purchasing a new wildcard certificate?

I'll put everything that I know about SSL protocol here:

We're using nginx server with we've enabled TLS. And this is the current nginx configuration.

server {
        listen          443 ssl;
        server_name     myonlinebank.example.com;
}

When I browse the site, the certificate shown is that of adguard. There's no option to view that site's own certificate.

Annanowa