PeoplePicker search returns results from both directories

Document ID : KB000076497
Last Modified Date : 06/04/2018
Show Technical Document Details
We have SharePoint 2016 integrated with db2 and AD. When we search a user we are receiving results from both the directories where as the requirement is to return results from just the one where the user is logged into.
People Picker will show results from AD for every TIP regardless of configuration, so AD results will be included in every search.  There is no way to avoid this.