Same here, all fixed. You need to do the uninstall, reboot to recovery, run the kext terminal command and then reboot and install the 5.2.1 beta 2 driver... Takes a few min but worked like a charm.
Note - The d6000 still wont work for me unless I use it with the USB-A adapter, but i suspect that's a Dell firmware and power management issue. I ALWAYS have my screens flash after about 5 min from when I first plug in the D6000. If I am using the USB-A adapter, it all comes back in a second or two, if I am using USB-C, it might come back, but generally the light on the Dell D6000 turns orange and it all just stops working. Switch to USB-A. all good again.
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