Looking at the Behaviors Plugin page in the Atlassian Marketplace, it is true that the current plugin version is only compatible up to JIRA 5.2.11:
Hence, I reviewed the plugin issue tracker, and found the following related request which addresses the plugin compatibility with JIRA 6:
Since this is the case, you may start following the related future issue for future updates on the matter.
Though it's not much, I hope that this will help.
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