Windows Server 2016 is not showing cumulative patches past 2018-05

Issue

Windows Server 2016 no longer displays any cumulative patches past 2018-05.

Cause

The device has 2018-05 Cumulative Update for Windows Server 2016 for x64-based Systems (KB4103720) installed, but not 2018-05 Update for Windows Server 2016 for x64-based Systems (KB4132216).

Resolution

Install the Windows Update 2018-05 Update for Windows Server 2016 for x64-based Systems (KB4132216). As per Microsoft's release notes, this update "addresses an issue that might sometimes lead to incorrect checks for applicability during installation of Windows Updates".