Previous plugin versions that worked:
cloudbees-bitbucket-branch-source 1.9
workflow-multibranch 2.9.2
scm-api 1.3

The basic problem is that I used to be able to add views (List view, Nested view, etc) to the bitbucket folder. Now that's gone and the existing views I had are also go. when I try to go to https://build.foo/job/bb_org/newView I get the normal create a view page, but when I create that view I get a 404 on https://build.foo/job/bb_org/view/some_view/configure.

Also all the view creating links are gone from the UI.

This is pretty bad if your Bitbucket org has hundreds of repos and you expect to use a single bitbucket folder and views inside that folder to organize the jobs.

Note that standard organizational folders still have views, just not the bitbucket one.