In included file, cannot set task dir with a variable containing absolute path

version: "3"

includes:
  incl:
    taskfile: ./Taskfile-incl.yaml

tasks:
  no-dir:
    cmd: "echo dir: not set, pwd: $(pwd)"

  dir-as-string:
    dir: "/tmp"
    cmd: "echo dir: /tmp, pwd: $(pwd)"

  dir-via-var:
    vars:
      FOLDER: "/tmp"
    dir: "{{.FOLDER}}"
    cmd: "echo dir: /tmp, pwd: $(pwd)"

version: "3"

tasks:
  no-dir:
    cmd: "echo dir: not set, pwd: $(pwd)"

  dir-as-string:
    dir: "/tmp"
    cmd: "echo dir: /tmp, pwd: $(pwd)"

  dir-via-var:
    vars:
      FOLDER: "/tmp"
    dir: "{{.FOLDER}}"
    cmd: "echo dir: /tmp, pwd: $(pwd)"

xxxxx@dev:~/tasktest$ pwd
/home/xxxxx/tasktest
xxxxx@dev:~/tasktest$ task no-dir dir-as-string dir-via-var incl:no-dir incl:dir-as-string incl:dir-via-var
task: [no-dir] echo dir: not set, pwd: $(pwd)
dir: not set, pwd: /home/xxxxx/tasktest
task: [dir-as-string] echo dir: /tmp, pwd: $(pwd)
dir: /tmp, pwd: /tmp
task: [dir-via-var] echo dir: /tmp, pwd: $(pwd)
dir: /tmp, pwd: /tmp
task: [incl:no-dir] echo dir: not set, pwd: $(pwd)
dir: not set, pwd: /home/xxxxx/tasktest
task: [incl:dir-as-string] echo dir: /tmp, pwd: $(pwd)
dir: /tmp, pwd: /tmp
task: [incl:dir-via-var] echo dir: /tmp, pwd: $(pwd)
dir: /tmp, pwd: /home/xxxxx/tasktest/tmp