The first part of the initially reported bug is somehow related to authentication. Pull #47/#48 would likely not help; these seem to be addressing an unrelated (possibly unfiled) bug, about the default value of a promotion parameter.
The second part, about cloudbees-folders-plus, is also probably an unrelated issue, and not necessarily in promoted-builds at all. Reporter, for issues specific to Jenkins Enterprise plugins please just file a support ticket so the problem can be analyzed. (Or even if not specific to Jenkins Enterprise and you just want to ensure you get helped.)
Included screenshots of both views.