[ERR] Error decoding response stream ##: EOF

I am using Packer to build a Windows Server 2019 and right after the [INFO] (telemetry) Finalizing. message and before the plugins exit I am getting the error message where 99 is the value of responseStreamId in communicator.go:

[ERR] Error decoding response stream 99: EOF

I can probably debug this using GoLand and Delve, but I am hoping that its an easy and obvious solution so I don’t have to do so much debugging work. Any ideas?

To reproduce it here is the repo. Run ./build.sh which takes about 50 minutes on my 2015 MacBook Pro w/16GB RAM.

Thanks in advance for any help.