Enhanced JQL query testExecWithTestRunsAssignedToUser with omitted User not working as expected

Description
The enhanced JQL query testExecWithTestRunsAssignedToUser returns an error if the user is omitted and it should return a list of Test Executions assigned to the current user logged in.

Pre-Conditions
The user needs to have at least one Test Run assigned to him.

How to reproduce

1. Go to the Issue Navigator and search using the following JQL query:

   issue in testExecWithTestRunsAssignedToUser()
   

Actual result/Attachments
It returns the following error:

Expected result
Since the User is omitted from the JQL, it should return the list of Test Executions assigned to the current user.

Workaround
As a workaround, you can use the User name on the JQL and it will return the correct values.