I probably haven’t been affected thanks to reports from Linuxnoob and you, so I stopped applying updates daily, as my Librem with PureOS is the only machine I can currently use for working from home. 
I looked again at Byzantium updates for my system a couple of hours ago, but I haven’t been able to infer from version numbers changes and Debian error report mentioned in Gnomeshell crashes after update from 25/26th of april - byzantium whether it has been fixed in Byzantium.