Strange env var override behavior

[aXe1]

If set some variable with shell, and override it with task parameter, then task will in some cases use one parameter and in some - another.

Taskfile.yml

version: 3
env:
  SOME_PATH: '{{if not (empty .PATH_PART)}}/some/path/{{.PATH_PART}}/file.txt{{else}}{{fail "PATH_PART not set!"}}{{end}}'
tasks:
  default:
    cmds:
      - echo _${PATH_PART}_
      - echo _{{.PATH_PART}}_
      - echo _${SOME_PATH}_
      - echo _{{.SOME_PATH}}_

Bug reproduce steps:

$ PATH_PART=foo task PATH_PART=bar
task: [default] echo _${PATH_PART}_
_foo_
task: [default] echo _bar_
_bar_
task: [default] echo _${SOME_PATH}_
_/some/path/bar/file.txt_
task: [default] echo _/some/path/foo/file.txt_
_/some/path/foo/file.txt_

$ task PATH_PART=bar
template: :1:73: executing "" at <fail "PATH_PART not set!">: error calling fail: PATH_PART not set!

$ PATH_PART=foo task
task: [default] echo _${PATH_PART}_
_foo_
task: [default] echo _foo_
_foo_
task: [default] echo _${SOME_PATH}_
_/some/path/foo/file.txt_
task: [default] echo _/some/path/foo/file.txt_
_/some/path/foo/file.txt_

• Task version: v3.39.0 (h1:Loe6ppP1x38Puv1M2wigp91bH/garCt0vLWkJsiTWNI=)
• Operating system: Windows 10 Pro x64
• Experiments enabled: