Bitbucket keeps outdated Bamboo build information

Precondition:
We require one successful build on our Bamboo Server (5.9.4 build 5919) to merge a pull
request.

Situation:
In our case we have several Bamboo projects working on the same bitbucket repository and some of them are using plan branches.

Bug
If one of the plan branches on Bamboo fails (other build params, merging strategy etc.) and this plan branch is deleted, Bitbucket will still show one build failed. As the plan branch doesnt exist on Bamboo anymore there is no chance to remedy this problem. If you click in Bitbucket on this failed (non-existing) job it will redirect to a Page not found page. Even after closing this pull request and opening a new one it will automatically detect this non-existing failed jobs again, so there is no chance to merge the pull request.