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Certificate for internal IP claims common name invalid, even though it is correct

I followed this guide with easy-rsa https://www.digitalocean.com/community/tutorials/how-to-set-up-and-configure-a-certificate-authority-ca-on-ubuntu-20-04

signing the certificate returns

subject=
    countryName               = AU
    stateOrProvinceName       = Some-State
    organizationName          = Internet Widgits Pty Ltd
    commonName                = 10.7.0.1

X509v3 Subject Alternative Name:
    DNS:10.7.0.1

I imported the root certificate into Windows and Firefox.

Now, whenever I browse to https://10.7.0.1 , they claim that the common name is wrong, even though it isn't:

What could be the problem here?

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