TTL of cached queries is always one query behind

[ghost]

Seemingly cached queries are returned with outdated TTL and only afterwards the TTL is updated for future queries.
Shouldn't the TTL be updated first, before returning?

What I did was making queries with increasing delay between them e.g. 5, 10, 15 seconds.
With delay 10s the TTL is only 5s down. With delay 15s the TTL is only 10s down. Always one query behind.

Adding a 3rd party DNS-cache fixes this, of course.

edit: fixed in #1895