I use gerrit 2.8.1.
In the documentation, there is a --verified option for the command 'gerrit review'.
When I enter the following command:
ssh -p 29418 jenkins@192.168.0.18 gerrit review --project TestGerrit --code-review 0 2,1

Everything is fine.
But when I enter the following command:
ssh -p 29418 jenkins@192.168.0.18 gerrit review --project TestGerrit --verified 1 --core-review 0 2,1
An error is displayed:
fatal: "--verified" is not a valid option

I think this is why the gerrit / jenkins plugin is hanging ... It still needs to send a --verified option which make the jenkins submission fails

When I look at the jenkins Logs, I see:

http://192.168.0.47:8080/job/gerrit_test/32/ : FAILURE' --verified -1 --code-review 0

There is no 'verified' menu in gerrit too. So, I think all the 'verified' things have been removed from Gerrit.