Assignee not rendered in assignment-popup.html

In my custom flowable modeler, I’m populating the assignee field with ${requestor} under Fixed value category, like this:

But once I click on assignments field to open it, the assignee field doesn’t get rendered with it’s value, like this:

So, as you can see the Assignee field still has the placeholder value only.
I checked in 2 files: assignment-popup.html and en.js, but couldn’t find any difference from the original files in flowable-modeler(which I downloaded and ran locally on tomcat).

Okay I just found the reason, there was a property missing in ‘properties-assignment-controller.js’ file while filling static area