I've seen limited reports of this on reddit and elsewhere.
When trying to install the first beta on either an iPhone XS or an iPad Pro 2018, the finder window containing the i(OS|PadOS) view immediately goes blank after selecting the beta IPSW following an option press of Update. The devices stay connected to the Mac running Catalina, and I can see their console log output continue to stream.
Anyone have the same issue?
Anyone have any suggestions?