Set current loggedin employee in link field

Screenshot_2019-05-15%20New%20Punch%20Request%201%20-%20New%20Punch%20Request%201

Here I need to set current loggedin employee so I set ‘user’ as default value of this link field. At first it was working but after latest update it does not.

@Khadija Fill doc filed with login user onload of doc type