When clicking a client on the blocked only side of the dashboard, it used to only display the blocked queries, since V6 it displays allowed and blocked
In V6 you have the ability to use the advanced filtering. If you go to Upstream > Blocklist you can filter only blocked. This is going to be the case for most things you can drill down to. Instead of providing a single function it allows you to do advanced filtering.
This was reported right after the v6.0 release.
This is a low priority fix, but we already have an open issue:
why is it low priority if it differs from V5
The behavior differs from v5.
At least I know its known about, and might be fixed eventually