Comment 2 for bug 1780159

It appears I have been fooled by caching.

Almost exactly 5 minutes after getting the incomplete list of projects, re-listing the projects yielded a complete list of projects.

I suspect caching because from the source code:

     # TODO(henry-nash): We might want to consider list limiting this at some
     # point in the future.
     @MEMOIZE_COMPUTED_ASSIGNMENTS
     def list_projects_for_user(self, user_id):
         # FIXME(lbragstad): Without the use of caching, listing effective role
         # assignments is slow, especially with large data set (lots of users
         # with multiple role assignments). This should serve as a marker in
         # case we have the opportunity to come back and optimize this code so
         # that it can be performant without having a hard dependency on
         # caching. Please see https://bugs.launchpad.net/keystone/+bug/1700852
         # for more details.

and from our config:
[cache]
expiration_time=600

What I still don't understand is why there appears to be no caching delay when we do the inherited role assignments first.

That being said, I don't think this is a bug anymore. More like a known issue that I didn't know about yesterday.