Currently, when you use event payloads on the Build status created you can only specify commit id  because each build status is keyed to a commit.

In case that you have 3 branches: master, development and feature_branch

and you create a PR between feature_branch–>master and feature_branch–>development

you will see the PR build status from master in the pull request page of feature_branch–>development

With this, we can't implement a way to update the relevant build status to a specific PR

Please support in your api a way to add to Build status & Build updated the pr id or source_branch and destination_branch

more details about the issue can be found here: https://github.com/jenkinsci/bitbucket-branch-source-plugin/issues/505

Docs: https://support.atlassian.com/bitbucket-cloud/docs/event-payloads/#EventPayloads-Buildstatusupdated