I have the exact same issue with dodocool usb hub. However, I've found that this problem happens only with usb 3.0 devices. You can solve it by plugging your power cable into the hub instead of directly in the laptop port, but you will find that your usb transfer speed will be really slow. Nevertheless, if you use it to connect your Mac with an external monitor (like me), you can't solve the problem for now. Seems that it is a sort of safety block on the ports or something like that. The only solution is to downgrade to Catalina or hoping for an upgrade in the following days.