I updated from 10.14.5 (18F132) to 10.14.6 (18G87) today in just over 10 minutes with one restart. As far as I can tell, all is working fine. I still get those pink lines across the top half of my screen when it is booting with the Apple logo and progression bar. I was hoping that would magically disappear.
Not everyone has this problem, but I do reliably.
On booting into Clover during the installer reboot, click the Gears icon. Tab to the Graphics section, Check the Inject Intel box, and introduce the 0x12345678 entree for the graphics ID. This is a meaningless code, but allows the default video to work through the installation reboot. It will not have any effect on subsequent reboots, and the regular Lilu and Whatevergreen settings will work for those.
It seems that the installer app from App Store has not been updated. It says it was updated a week ago, when 14.6 has been launched. Has someone updated the app and can now confirm the installer app has been updated? I want to get the latest Mojave on the pen drive, especially when this updates causes very nasty issues.