Critical issue in the SharePoint Server 2016 CU (February 2019 CU)

The SharePoint Server 2016 update (February 2019 CU) contains a critical issue affecting the search service, specifically returning search results for non-default zones. .
See: After security update 4462155 is installed, search queries that are run from a nondefault zone URL (an extended zone) don’t return any results.

Update 28.02.2019
A new CU has been released today

• KB 3085363 – February 2019 Update for SharePoint Server 2016 (language independent)

The new CU fixes this critical issue and replaces the original CU.