[jaachan]

Testing my DNS server gets me:

    edns=ok edns1=noerror,badversion,soa
    ednsopt=ok edns1opt=noerror,badversion,soa

Wikipedia doesn't mention anything about EDNS versions, so I'm not sure what to make of it.

[pilif]

likely your DNS server is using PowerDNS. Versions before 4.1.0-rc1 had a bug with the query cache:

https://github.com/PowerDNS/pdns/issues/6806

This issue isn't affected by the configuration change on flag day and judging by the slow adoption so far, by the time where edns support really gets mandatory, the current version of the distro at that time will long have updated their built-in PowerDNS version.

[j16sdiz]

Those are test name, not version. The test is detailed in the test report, you just need to read all the text..