In Tasks timeline view - Assigned resource column
If you type too fast/before some resources are loaded in view, the search box disappears. So if there is any latency and the user starts typing before the first initial resources are loaded then the box will disappear
Steps to Reproduce:
Pre-requisites
Need to have an environment with 10k+ resources
In MUX
Expected Result - The user can type in the name and it filters
Actual Result - The user types in the name and the search bar closes
16.2.2
DE116393
Fixed in 16.3.0