I can verify this behaviour.
bachaina
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I can confirm that installer plugins are working again in beta 4.
Yes i have this issue too. I can see the circle where the Installer Plug-In should be, but it is not shown.
I also opened an issue yesterday about this.
I allready gave the macOS Installer Full Disk Access and also opened the pkg as root, but i still get an error which hints to missing permissions.