Hi, 
we updated the plugin to the latest version and we were facing loosing permissions issue on some folder.
As well stored credentials were wiped.

After some looking, it looks like this - folder - plugin is causing the issues.

Issue is:

• when there was an update on the folder, then from some reason config.xml for the given job/ folder in this case will become unreadable for jenkins
• that results in deletion of stored data like permissions configuration, or stored credentials on the given folder (config.xml is probably ignored / replaced by soem default one)
• subjobs are not impacted

We noticed on impacted folder was in config.xml file:

<com.cloudbees.hudson.plugins.folder.Folder plugin="cloudbees-folder@6.4">

On non-impacted:

<com.cloudbees.hudson.plugins.folder.Folder plugin="cloudbees-folder@6.3">