Is this a BUG REPORT or FEATURE REQUEST? (choose one):

Tendermint version (use tendermint version or git rev-parse --verify HEAD if installed from source):

ABCI app (name for built-in, URL for self-written if it's publicly available):
My ABCI app base on PersistentDummyApplication.

Merkleeyes version (use git rev-parse --verify HEAD, skip if you don't use it):

Environment:

• macOS (e.g. from /etc/os-release):
• Install tools:glid
• Others:tendermint 0.16.0

What happened:

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else do we need to know:
I've done a test:
In EndBlock function, I add a new validator to ResponseEndBlock.ValidatorUpdates and return it. When I send message by "http://192.168.1.2:46657/broadcast_tx_commit",the new validator don't join net. The Result Validators includes the new validator by "http://192.168.1.2:46657/dump_consensus_state".But, other validators don't.
What‘s wrong or what to miss?
Thanks!
Forgive, my english is bad.