https://wccftech.com/windows-10-cpu-bug-added-in-the-known-issues-fix-coming-mid-september/

Earlier this week, we reported another issue that was spotted in the latest Windows 10 May 2019 Update. The second August cumulative update, which is an optional, non-security update, brought with it a Cortana/SearchUI.exe bug that resulted in some users experiencing high CPU and memory usage.

Then, users reported that they weren’t receiving Search results. “Search box is there but when searching something, only a black box is shown without showing any results,” a user had written.