[bug] release-please opens a new pr with *all* changes after the last one has been merged

#### Environment details

- used via https://github.com/google-github-actions/release-please-action
- `release-please` version: ^16.5.0

#### Steps to reproduce

I dunno 😅

#### Situation

We've set release-please up the following way:

- https://github.com/teutonet/teutonet-helm-charts/blob/main/.github/release-please/config.json
- https://github.com/teutonet/teutonet-helm-charts/blob/main/.github/release-please/manifest.json
- https://github.com/teutonet/teutonet-helm-charts/blob/main/.github/workflows/create-release-prs.yaml
- https://github.com/teutonet/teutonet-helm-charts/blob/main/.github/workflows/release-chart.yaml

and it works 99%. But, after we release something, like with https://github.com/teutonet/teutonet-helm-charts/pull/796, release-please opens another PR which includes all changes for that component, see https://github.com/teutonet/teutonet-helm-charts/pull/810 via https://github.com/teutonet/teutonet-helm-charts/actions/runs/8099257224/job/22134582665.

Maybe this has something to do with https://github.com/teutonet/teutonet-helm-charts/actions/runs/8099257224/job/22134582665#step:2:34 ?