I have the exact same issue, the device crashes once connected or disconnected from the charger, I am also on MacBook Pro early 2020 (intel, 4 thunderbolt ports). Currently I still cannot find any work around, what I have to do to connect to power is to shut down the device completely, close the lid, plug in, wait a while before open the lid to boot the system normally, but then again, once you disconnect the charger, it will crash. I tried to restore to Public Beta 1 - 23A5286i (same build as Dev Beta 3) via recovery mode, but the issue still persisted.