Entity Framework integration stopped working since 2019.2

00:28:33.231 |I| EntityFrameworkRunnerProgram | :1 | Using EntityFramework 6.2.0
00:28:35.294 |E| AddMigrationRunner | :1 | Inner exception stack trace: System.InvalidOperationException: No connection string named 'XXXXContext' could be found in the application config file. at System.Data.Entity.Internal.LazyInternalConnection.get_ConnectionHasModel() at System.Data.Entity.Internal.LazyInternalContext.InitializeContext() at System.Data.Entity.Internal.InternalContext.Initialize() at System.Data.Entity.Internal.InternalContext.ForceOSpaceLoadingForKnownEntityTypes() at System.Data.Entity.DbContext.System.Data.Entity.Infrastructure.IObjectContextAdapter.get_ObjectContext() at 

Visual Studio does this perfectly on the very same project. application config file is present and contains connection string.