Task assignment doesn't work well with Fast sync setup

[nupoorkhandelwal]

Describe the bug
In task assignment organisation, whenever a user sets up a fast sync on his device the task unassignment (ie. if a task assigned to him previously is now assigned to a another user) does not reflect on his device until unless the fast sync db is cleared and user does a fresh sync.

To Reproduce
Steps to reproduce the behavior:

1. Go to Power UAT org
2. Click on Assignment
3. Assign couple of tasks to a user
4. Let the user sync and see both the tasks that are assigned to him have synced to his device
5. Let the user setup fast sync
6. Now reassign these tasks to another user
7. Now even after multiple syncs the task assignment changes won't reflect of the first user's device.

Expected behavior
Ideally, the change in task assignment should reflect irrespective of the fast sync setup on a user's device.

Developer Checklist
Developer fixing the bug should fill this checklist.

• Does the fix require extensive regression testing?
• Are you mentioning the required scenarios that could be affected?

[vinayvenu]

We should test this on prerelease once to see if it recurs. There has been change in the way direct assignments sync.