Nullreferencexception scaffolding foreign key without primary key (regression)

[kobruleht]

Create tables in Postgres 15 or earlier database

create table testdok ( dokumnr serial primary key );

CREATE table testSKONTROL (
  dokumnr integer not null  references testdok on update cascade on delete cascade deferrable
 );

Scaffold database using ef core data provider for PostgreSql.

Observed:

System.NullReferenceException
  HResult=0x80004003
  Message=Object reference not set to an instance of an object.
  Source=Microsoft.EntityFrameworkCore.Design
  StackTrace:
   at Microsoft.EntityFrameworkCore.Scaffolding.Internal.CSharpDbContextGenerator.TransformText() in Microsoft.EntityFrameworkCore.Scaffolding.Internal\CSharpDbContextGenerator.cs:line 254

EF Core version: 7.0
Database provider: https://github.com/npgsql/efcore.pg
Target framework: .NET 7.0
Operating system: Windows 11
IDE: Visual Studio 2022 Version 17.4.2

[ajcvickers]

Duplicate of #29516.