fall into afb_api_call_sync

As the title, when I tested my program in lastest master environment, I found this issue. The test procedures as below:
1. use "afm-util install xx.wgt" to install new application
2. look at launcher application for checking whether application list is updated.

The result was not update.
From the journalctl log I found that when homescreen-service received application-list-changed event from afm-main it tried to get runnalbes list from afm-main, then it falled into "afb_api_call_sync" api. But when I used old version master environment (2018/12/18) , homescreen-service didn't fall into "afb_api_call_sync".
Upper description may not be easy to understand， please reference error_sequence.png.

related source
related jira

I had two issues as below:
1. why in lastest version homescreen-service could fall into "afb_api_call_sync" when received "application-list-changed" event?
2. how can I rollback af-main and af-binder to old version in lastest master environment?

2019-03-06 :
I changed af-binder version to "Remove useless %lang% prefix in yaml book file" at 2018-12-19, then this issues didn't happen, but the application starting speed became slow.