For instance: #19540 fails with:

https://github.com/scikit-learn/scikit-learn/pull/19540/checks?check_run_id=1977937609

Run echo "PR_NUMBER=19540" >> $GITHUB_ENV
  echo "PR_NUMBER=19540" >> $GITHUB_ENV
  echo "TAGGED_MILESTONE= >> $GITHUB_ENV
  shell: /usr/bin/bash -e {0}
/home/runner/work/_temp/6f19004d-8375-4b36-bace-92557dca6c17.sh: line 2: unexpected EOF while looking for matching `"'
Error: Process completed with exit code 2.

while it passed on other PRs without conflicts. Hence I suspect that the conflicts are causing this but I am not 100% sure.

Something weird: this check should be skipped because it is labeled "No Changelog Needed". I edited the PR description to make sure that the PR was labeled prior to re-running the changelog check and it's still failing with the above message.

/cc @cmarmo