Default partition_count is null on aws_placement_group in 3.63.0

[bacoboy-doordash]

#15360 introduced partition_count as "optional" on aws_placement_group, but if the strategy is partitioned then the default says it should be 2, but is in fact null is applied resulting in a force replacement.

+/- resource "aws_placement_group" "origin_nodes" {
      ~ arn                = "arn:aws:ec2:us-east-2:XXXXXX:placement-group/my-pg" -> (known after apply)
      ~ id                 = "my-pg" -> (known after apply)
        name               = "my-pg"
      - partition_count    = 2 -> null # forces replacement
      ~ placement_group_id = "pg-07ee5cfebfa8ee032" -> (known after apply)
        # (2 unchanged attributes hidden)
    }

[ewbankkit]

@bacoboy-doordash Thanks for raising this issue.
It has already been noticed in #21446. I'm going to close this one as a duplicate so that we can concentrate discussion in the linked issue.
Please add any additional comments there.

[github-actions]

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