Security panel does not reflect security lock type after changing it

Enviroment:

current build number: 204
device name: frieza
channel: ubuntu-touch/rc-proposed/bq-aquaris-pd.en
last update: 2016-10-06 08:32:15
version version: 204
version ubuntu: 20161006
version device: 20160809.0
version custom: 20160831--42-26-vivid

Reproduce:
1. Go System settings>Security&Privacy>Locking and unlocking>Lock security
2. Set a 4 digit passcode and press back button in upper left(If you already had 4 digit skip this step)
3. From this view you can check that Lock security is set as passcode
4. Now enter Lock security again, change it to pass-phrase and press back again

What happened:
when changing between passcode and passphrase does not update the security type in System settings>Security&Privacy>Locking and unlocking view

What did I expect:
once you change from 4 digit passcode to passphrase or vice versa, the locking & unlocking view should be updated with the correct security type

Add info. once you close and reopen system settings lock type is correctly updated.