I've run some tests with Jenkins 2.7.4 and Bitbucket Branch Source Plug-in 1.8 and apparently this feature works perfectly well for ordinary Multibranch, but is not supported by ie. Bitbucket Team/Project.

Example:

properties([pipelineTriggers([upstream(
        threshold: hudson.model.Result.SUCCESS,         
        upstreamProjects: "another-job")])])