Same issue as this one...
https://community.atlassian.com/t5/Bitbucket-questions/Pull-Request-Transition-Jira-Issue-suddenly-unavailable/qaq-p/2337242
We’ve started facing the same issue that Dominik mentioned in the above question. Suddenly, in the last couple of days, we no longer see the linked issue in the Jira issues sidecar within the Bitbucket pull request, which blocks us from transitioning the Jira issue within Bitbucket when merging. As you can see from the below screenshot, we've tried adding the issue Id in PR title, description, branch name and even in commits.

However, like Dominik, we still see the linking in Jira’s development section without any issues.

Could someone help provide some insights on this.
Thanks!