Facing Issue while Sorting in Canvas Apps

Hi All,

I have created dropdown field in Canvas app and connected it with 'Design Project Task' Entity which is having option set named as 'Task Status'. 
I used following formula in item of Dropdown I created in Canvas App:

Sort(Distinct('Design Project Tasks', 'Task Status'), Ascending)

Now, it is showing me Distinct Option Set list. But not sorting this list. 

1. I Checked field option values in solution. They are in sequence.

2. I tried SortByColumns formula but it is not working.

It looks something like this:

Have anyone worked on same issue?

It will be really helpful.

Thanks,

Mayur