Setting up Python 3.14t on windows-11-arm runner doesn't work since January 12

[w8sl]

Description:
I'm not sure if this issue is a duplicate as everything was working until January 12th. The downloaded Python 3.14.2 image is
exactly the same, including the SHA-256 checksum. CIBW update is coincidental. Affected steps are not using CIBW

Successful run: Jan 12 at 7:48 PM GMT+1
https://github.com/rasterio/rasterio/actions/runs/20931105785/job/60151291265#step:3:1

Broken since Jan 12 at 11:07 PM GMT+1
https://github.com/rasterio/rasterio/actions/runs/20936661761/job/60168515989#step:3:1

Action version:
actions/setup-python@v6

Platform:

• windows-11-arm

Runner type:

• Hosted

Tools version:
Python 3.14t

Repro steps:

name: Set up Python 3.14t on windows-11-arm

on: [push]

jobs:
  test-python:
    runs-on: windows-11-arm
    steps:
     
      - uses: actions/checkout@v6
      
      - name: Set up Python 3.14t (freethreaded)
        uses: actions/setup-python@v6
        with:
          python-version: '3.14t'
          architecture: 'arm64'

Expected behavior:
Working as before. Appreciate any hint about what may be broken.

Actual behavior:
Issue persists as of Jan 17

[MugundanMCW]

Python 3.13t also fails with similar issue[xref] on Windows-11-arm runner.

[dpdani]

I'm having the same issue here. The same workflow file wasn't having problems on Jan 10.

[w8sl]

It doesn't work at al: neither matrix, single version of Python 3.14t nor Python 3.14 with freethreaded: true works

[priyagupta108]

Hello @w8sl 👋,
Thank you for your report. We'll investigate the issue and get back to you with the details!

[alex]

This regression has also been reported to the ARM issue tracker: actions/partner-runner-images#154