[NotInParallel] behaviour

[filipbroniek]

I have some tests on database that need's to be performed individually. but I want to run other tests (that are unrelated to DB) in parallel to them.
Actual behavior:

public class MyTests
{
      private const string DATABASE_GROUP = "Database";

      [Test]
      [NotInParallel(DATABASE_GROUP)]
      public async Task DbTest1() // Runs 2nd
      {
           //...
      }
      [Test]
      [NotInParallel(DATABASE_GROUP)]
      public async Task DbTest2() // Runs 3rd
      {
           //...
      }
      [Test]
      public async Task OtherTest() // Runs 1st
      {
           //...
      }
}

Expected behaviour:

public class MyTests
{
      private const string DATABASE_GROUP = "Database";

      [Test]
      [NotInParallel(DATABASE_GROUP)]
      public async Task DbTest1() // Runs 1st with OtherTest, and with other tests without NotInParallel as well...
      {
           //...
      }
      [Test]
      [NotInParallel(DATABASE_GROUP)]
      public async Task DbTest2() // Runs 2nd
      {
           //...
      }
      [Test]
      public async Task OtherTest() // Runs 1st with DbTest1
      {
           //...
      }
}

I expected to OtherTest to run concurrently to tests in DATABASE_GROUP group. But actual behavior is that DATABASE_GROUP waits for OtherTest to finish before it starts.

The only workaround I found is to decorate every non db test with [NotInParallel("some unique value")] in order to run it concurrently. But It's a boilerplate code that I need to add for each non db test.

Is it expected behavior? If yes, is there any other workaround for this?