Github Release and tag is not created when merging the release PR using the Github CLI

[nils1k]

Describe the error

Neither a tag, nor a release, is being created when merging the release PR using the Github CLI.

Steps to reproduce

1. Push a commit so that a release PR is generated
2. Merge the PR manually so that a release and tag are created
3. Push a commit so that a new release PR is generated
4. Use the Github CLI to merge the release PR, e.g. gh pr merge <pr_number> --squash
5. The release PR is merged, but neither a release, nor a tag, is a created

Please refer to the sample code that reproduces the issue.

Workaround

A workaround seems to be to add the release-please:force-run label to the merged PR, as suggested in the README.

Notes

This issue was originally posted in the release-please-action repository, but I'm posting it here as well as I'm unsure about where the issue belongs.