This is not correctly described. The issue was only once reproducable by Stefan on his machine when building an ARA plugin/host. Never again and not on another machine.
I suspect that a faulty build was the reason as no VST3 plug-in build with the previous SDK failed on any newer or older host. And we have code in the SDK that checks that these errors are not happening.
So don’t panic.
Cheers,
Arne