My apologies I have written wrong your nickname, that's due to the hurry.
If you haven't updated in place... then I must stop that guy from updating in place!
Really I have some Finder issues using mainly in View Mode "List" the folders autoclose, go back to previous without any interactions, I don't why it happens, with IOAccelerator from beta1 doesn't occur, I'm booting from external SSD the same Mojave beta 4 installation I use even on another unsupported MBP intelHD3000, and the same one also working on a supported Mac, I've made a kind of universal prelinkedkernel for all my machines, that's why I need to use all the five IOUSB***, with only two of them I get crashing on the supported Mac, but on the supported Mac internally I have also a native Mojave beta 2, in short it's a caos.
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Please don't update, wait some other confirmations.
If you use the latest version of Mojave Beta Patcher everything will work like a charm.