Has anyone else gotten reports of 2018/2019 TouchBar 15" machines failing to boot after installing 10.15.4? We've had two reports of this from different users across the country from one another, and both have reported the installers running then cutting to black and the machines being unresponsive. The users have reported not having additional peripherals installed nor forcing the machines to shut down. SMC resets and port/power outlet shuffle do not resolve anything.
@andrew.nicholas During the 10.15.4 update process Macs with the T2 chip will also install a BridgeOS firmware update. As part of the update process the Mac turns itself off. If the user turns the Mac back on before the BridgeOS update completes and turns the Mac back on they may run into the problem that was seen with earlier updates where the drive encryption keys are wiped which renders internal storage unreadable.