When having a group of concurrent events for a resource that has a parent, when collapsing the events it's working fine but then when collapsing on the parent level, the [+n] it's moving on others resources. In addition, when clicking on then "moved" [+n], it's simply disappearing. Basically, the group concurrent events it's not working when using tree resources. I used for testing http://javascript.daypilot.org/demo/scheduler/groupconcurrent.html adding 2 events for the Room A.1 then collapsing events in room A.1 and then collapsing Room A.
Thanks