Good Day, Yesterday (28 Mar 2020), I updated my Raspberry Pi 4 running Raspbian Buster and only three files were installed:
bluez libbluetooth3 libicu63 Prior to these files being installed, both my Bluetooth keyboard and mouse functioned normally. Once the three files were installed and the system rebooted, the Bluetooth keyboard and mouse stopped working. I am able to repeat the problem. Hence and have confirmed others are having this issue. I am trying to submit a bug report - but as a novice, I do not know what "package" to report in the ReportBug program. Your help pls. Thank you, Dave Scanned by McAfee and confirmed virus-free. Find out more here: https://bit.ly/2zCJMrO

