Copier is messing up Umlaut on template update

[laenan8466]

Describe the problem

When entering an Umlaut (ö,ü,ä) to an answer everything is written correctly. But on updating the template, copier is messing it up.

Template

New template with git initialized (and tagged)

{{_copier_conf.answers_file}}.jinja:

# Changes here will be overwritten by Copier
{{ _copier_answers|to_nice_yaml -}}

copier.yml:

umlaut:
  type: str
  help: Type an umlaut (ö,ü,ä).

umlaut.md.jinja:

{{ umlaut }}

To Reproduce

1. copier copy -d umlaut=ä .\template\ .\test\ (PowerShell)
2. cd test
3. git init, git add ., git commit -m 'first'
4. copier update --trust

Logs

On update you will see:

Updating to template version 0.2.0
🎤 Type an umlaut (ö,ü,ä).
   ä

The .copier-answers.yml-file and the umlaut.md file will be overwritten with ä

Expected behavior

No overwriting. Keep ä in .copier-answers.yml-file and the umlaut.md file

Screenshots/screencasts/logs

No response

Operating system

Windows

Operating system distribution and version

Windows 11

Copier version

9.4.1

Python version

3.13.2

Installation method

local build

Additional context

Independent of build method, here uvx was used.

[sisp]

Thanks for reporting this bug, @laenan8466! 🙏 I've been able to reproduce the problem on Windows 11 and submitted #1970 that fixes it.

[laenan8466]

Do you know when you plan a new release, including this fix?