.Net 5 RC 1.20451 Blazor App Fails to launch

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I realise this is pretty 'bleeding edge' stuff so no complaints. I just wonder if anyone else is having the same issue. I am trialing .Net 5 Blazor Web Assembly and have been expanding out from the template app. Local server with built in auth. I have reached a point, size, complexity.. hard to pin down where the app just crashes out when trying to run a debug build. It seems to kill the .NET Host because if I go and remove it using task manager, with a clean start, I can then run it just fine -once. On the second occasion there is an exception and the launch adapter fails to start.. see the two errors in the image: VS Null exception error

There is very little more information since it has failed in 'external code' and I can't get to it to see if I have set something up incorrectly as a null ? This error message came from the 'Copy Details link':

Exception

Any ideas anyone... I was hoping the RC would be about ready for primetime, but I realise that is why it is a release candidate... I am using VS 2019 16.8.0 Preview 3.2

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