Creation & deletion of audio groups doesn't get updated in project window

Steps to Repro:
1. Create/Select audio mixer > audio mixer window
2. Add multiple audio mixer groups
3. observe that newly created audio mixer group are not reflecting in hierarchy

Actual Result:
State of audio mixer groups are not reflecting in project window on creation and deletion

Expected Result:
On creation audio mixer groups should reflect in project window simultaneously

Workaround:
Add a new snapshot > observe the audio groups are updated in project window

Occurring with:
2018.1.0b1, 2017.3.0f3, 2017.2.1f1, 2017.2.0f1, 2017.2.0b11

Working with:
2017.2.0b6, 2017.2.0b1, 2017.1.2f1

Environment:
Occurring on Mac & Windows