I wanted to integrate the required modifier for models generated with scaffolding, but it don’t want to set it for auto increment keys.
I wanted to read ValueGenerated to detect auto increment keys, but somehow the t4 script doesn’t even compile and I get these errors:

System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.EntityFrameworkCore.Scaffolding.Internal.TextTemplatingModelGenerator.GenerateModel(IModel model, ModelCodeGenerationOptions options)
   at Microsoft.EntityFrameworkCore.Scaffolding.Internal.ReverseEngineerScaffolder.ScaffoldModel(String connectionString, DatabaseModelFactoryOptions databaseOptions, ModelReverseEngineerOptions modelOptions, ModelCodeGenerationOptions codeOptions)
   at Microsoft.EntityFrameworkCore.Design.Internal.DatabaseOperations.ScaffoldContext(String provider, String connectionString, String outputDir, String outputContextDir, String dbContextClassName, IEnumerable`1 schemas, IEnumerable`1 tables, String modelNamespace, String contextNamespace, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames, Boolean suppressOnConfiguring, Boolean noPluralize)
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContextImpl(String provider, String connectionString, String outputDir, String outputDbContextDir, String dbContextClassName, IEnumerable`1 schemaFilters, IEnumerable`1 tableFilters, String modelNamespace, String contextNamespace, Boolean useDataAnnotations, Boolean overwriteFiles, Boolean useDatabaseNames, Boolean suppressOnConfiguring, Boolean noPluralize)
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.ScaffoldContext.<>c__DisplayClass0_0.<.ctor>b__0()
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>c__DisplayClass3_0`1.<Execute>b__0()
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
Object reference not set to an instance of an object.

I enabled t4 debugging:

<#@ template debug="true" #>
<#
    System.Diagnostics.Debugger.Launch();
#>

But the debugger doesn’t even launch, which means the t4 wasn’t compiled.
Is there a way to find out why?

I added <#@ import namespace="Microsoft.EntityFrameworkCore.Metadata" #> but that doesn’t help and I can access the other IReadOnlyProperty fields, just ValueGenerated ends in errors.
I set a breakpoint when property was accessed and I can see in the debugger that the property instance holds ValueGenerated, so it should be accessible.

I’m using the 9.0.0 versions and Postgres:

Scaffold-DbContext 'Name=ConnectionStrings:Postgres' Npgsql.EntityFrameworkCore.PostgreSQL -Tables public.test -context TestDbContext -OutputDir Models -Force