So this is now fixed. For anyone else who encounters this with golang 
protobuf 1.20 APIv2, I modified go.mod to include the latest release from 
github as a temporary fix:

google.golang.org/protobuf v0.0.0-20200305173516-13e7f145cc57

instead of 

google.golang.org/protobuf v1.20.0

because this deadlock fixed in commit : 
See 
https://github.com/protocolbuffers/protobuf-go/commit/13e7f145cc5761dc68252f725d240d04b641b01d

It's basically a deadlock on registration / initialisation of a descriptor.

Mark

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