Steps to reproduce

1.  add startuptasks that boostrap role and try to assign it to group
2.  

.. Logs, screenshots, gifs...

Expected results

role is bootstraped and assigned

.. Justify non-trivial expectations with a link to a doc or a relevant discussion.

Actual results

role is bootstraped but not visible for assigment task. Assigment task warns that role doesn't exist and do nothing.

Workaround

run startup phase twice

Development notes

Probably caused by different phase,. In install/update phase it works.
See info.magnolia.cms.security.RepositoryBackedSecurityManager#findPrincipalNode(java.lang.String, javax.jcr.Session, java.lang.String, javax.jcr.Node)
We need stable mechanism to update saas instance. Startuptasks are just temporary solution that can be replaced with better one.