prerender fails on new angular-cli 12 app

[amitport]

using @angular/cli@12.0.1

ng new app
ng add @nguniversal/express-engine
npm run build:ssr
npm run prerender

gives the following error:

Schema validation failed with the following errors:
  Data path "" must have required property 'serverTarget'

manually adding "serverTarget": "appname:server:production" to angular.json seems to work, but this probably should be done by the @nguniversal/express-engine schematics

I get that there may be a configuration step I'm missing, but the documentation is very unclear about this, and I couldn't find additional info about the prerender npm task.

Thank you

[alan-agius4]

@amitport indeed this is bug

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