variable declaration prevents workflow from running in parallel in dxCompiler 2.10.2 about dxcompiler HOT 5 CLOSED

version 1.0
task t1 {
  input {
    String s
  }
  command <<<
  echo t1 >s
   >>>
   output {
     File out = "s"
   }
}

task t2 {
  input {
    Array[String] s
  }
  command <<<
	echo t1 >s
  >>>
  output {
    File out = "s"
  }
}

task dummy {
  input {
  }
command <<<
>>>
  output {
  }
}

workflow tinytest3 {
	Array[String] chr_num = ["1"]
	Array[String] chrs = prefix("chr", chr_num)
        call dummy

	call t2 {input: s = chrs}
	scatter (chr in chrs) {
		call t1 { input: s = chr }
	}
	output {
		Array[File] out1 = t1.out
		File out2 = t2.out
	}
}

workflow tinytest {
  Array[String] chr_num = ["1"]
  Array[String] chrs = prefix("chr", chr_num)
  scatter (chr in chrs) {
    call t1 { input: s = chr }
  }
  call t2 {input: s = chrs}

workflow tinytest2 {
  Array[String] chr_num = ["1"]
  Array[String] chrs = prefix("chr", chr_num)

  call t2 {input: s = chrs}
  scatter (chr in chrs) {
    call t1 { input: s = chr }
  }

workflow tinytest3 {
  Array[String] chr_num = ["1"]
  Array[String] chrs = prefix("chr", chr_num)
  call dummy

  call t2 {input: s = chrs}
  scatter (chr in chrs) {
    call t1 { input: s = chr }
  }

$ dx describe workflow-GGGQzJ00Bvbj46PP4gjFyXP9 --json | jq '.stages|.[]|{id: .id,name: .name, input: .input}'
{
  "id": "stage-common",
  "name": "common",
  "input": {}
}
{
  "id": "stage-1",
  "name": "frag dummy",
  "input": {}
}
{
  "id": "stage-2",
  "name": "t2",
  "input": {
    "s": {
      "$dnanexus_link": {
        "outputField": "chrs",
        "stage": "stage-1"
      }
    }
  }
}
{
  "id": "stage-4",
  "name": "scatter (chr in chrs)",
  "input": {
    "chrs": {
      "$dnanexus_link": {
        "outputField": "chrs",
        "stage": "stage-1"
      }
    }
  }
}
{
  "id": "stage-outputs",
  "name": "outputs",
  "input": {
    "t1___out": {
      "$dnanexus_link": {
        "outputField": "t1___out",
        "stage": "stage-4"
      }
    },
    "t2___out": {
      "$dnanexus_link": {
        "outputField": "out",
        "stage": "stage-2"
      }
    }
  }
}