As described in https://github.com/ssllabs/ssllabs-scan/issues/690, if your server only supports a protocol like TLS 1.0 when not using SNI, the report generated from SSL Labs says that your server does support the protocol, however, https://github.com/ssllabs/ssllabs-scan/issues/690#issuecomment-490231155 says that it does not affect your grade and there is a tooltip which says that support was only observed with a client without SNI.
This is not the behavior I am seeing with SSLv3 though. The behavior I am seeing is that it is reported that your server supports SSLv3 which negatively affects your grade. Is there a reason for this behavior?
In case it's useful, I created a Dockerfile which sets up a server with this behavior. It can be found at https://gist.github.com/bmw/048511815860f63bfee8d2420ec119ca.