I‘ve just installed beta2. Now my MacBook Pro 2018 doesn‘t startup anymore. Progress bar on black screen raises to the end, but becomes slower and slower till end, then MacBook boots again. Already several times. Restore (Option+Cmd+r) does nothing.
Beta1 did work, except permanent errors in preferences.
Seems beta2 doesn't like my docking station (CalDigit TS3 plus) anymore. At least it doesn't startup anymore, when it is connected. After detatching it, startup works again. I can also attach and use the docking station (and connected display Acer Predator X34) again once macOS is running.