1.8.0 - DoT SNI on upstream queries

[ѽ҉ᶬḳ℠]

Hi,

the following error showing in unbound logs when querying an upstream
server over DoT on port 443:
 
> outnettcp got tcp error -1

The upstream server in question is also serving DoH and web content on
the same ip/port (443) and thus inquiring clients are supposed to
utilize SNI in order to be served the respective connectivity.

Has unbound support for SNI in upstream queries?