Terraform: Terraform plan does not show any error for bucket/Iam policy?

I faced 2 scenarios where terraform did not point out an error during the execution of terraform plan and I am wondering if is this a bug or if this is how bucket/iam policies work ( i.e determined at the time of terraform apply )

scenario 1 : when there was an error in condition for s3 bucket policy Bool was written as bool

data "aws_iam_policy_document" "alb_log" {
  statement {
    effect    = "Allow"
    actions   = ["s3:PutObject"]
    resources = ["${aws_s3_bucket.alb_log.arn}/*"]
    principals {
      type        = "AWS"
      identifiers = [data.aws_elb_service_account.main.arn]
    }
  }
  statement {
    sid     = "AllowSSLRequestsOnly"
    effect  = "Deny"
    actions = ["s3:*"]
    resources = [
      aws_s3_bucket.alb_log.arn,
      "${aws_s3_bucket.alb_log.arn}/*"
    ]
    condition {
      test = "bool"
      values = [
        "false"
      ]
      variable = "aws:SecureTransport"
    }
    principals {
      type        = "*"
      identifiers = ["*"]
    }
  }
}

resource "aws_s3_bucket_policy" "alb_log" {
  bucket = aws_s3_bucket.alb_log.id
  policy = data.aws_iam_policy_document.alb_log.json
}

scenario 2 : I added principals to iam policy, terraform plan should point this but the fact principals cannot be added in iam policy is told during terraform apply

data "aws_iam_policy_document" "artifact2" {
  statement {
    sid     = "AllowSSLRequestsOnly"
    effect  = "Deny"
    actions = ["s3:*"]
    resources = [
      "arn:aws:s3:::${aws_s3_bucket.artifact2.id}",
      "arn:aws:s3:::${aws_s3_bucket.artifact2.id}/*"
    ]
    condition {
      test = "Bool"
      values = [
        "false"
      ]
      variable = "aws:SecureTransport"
    }
    principals {
      type        = "*"
      identifiers = ["*"]
    }
  }
}

resource "aws_iam_policy" "firehose" {
  policy = data.aws_iam_policy_document.artifact2.json
}