chocolatey030,
Based on the screenshot on the linked Stack Exchange question, you're referring to Bitbucket Cloud (bitbucket.org), not Bitbucket Server (which doesn't have a "Close branch" toggle on its pull request creation screen). You'll want to raise your issue in their tracker, not here. This tracker is only for Bitbucket Server, and is not monitored by the development team that maintains Bitbucket Cloud.
Best regards,
Bryan Turner
Atlassian Bitbucket
chocolatey030,
Based on the screenshot on the linked Stack Exchange question, you're referring to Bitbucket Cloud (bitbucket.org), not Bitbucket Server (which doesn't have a "Close branch" toggle on its pull request creation screen). You'll want to raise your issue in their tracker, not here. This tracker is only for Bitbucket Server, and is not monitored by the development team that maintains Bitbucket Cloud.
Best regards,
Bryan Turner
Atlassian Bitbucket