I have a insight object and I allow user to search the field using the department.
For example: I have department link to department code, each department have a team.
User can enter the department code and search the team associate with it
In this case, you can see that we have a team associate with 701
But when we finish typing 701, no options will show up. This function should work. If i recreate the custom field and add it back, it will work for a while.