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

#### 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 --squash`
5. The release PR is merged, but neither a release, nor a tag, is a created

Please refer to the [sample code](https://github.com/nils1k/release-please) 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](https://github.com/googleapis/release-please?tab=readme-ov-file#step-3-rerun-release-please).

#### Notes
This issue was originally posted in the [release-please-action](https://github.com/googleapis/release-please-action/issues/1067) repository, but I'm posting it here as well as I'm unsure about where the issue belongs.