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XNAT 1.8.6 includes a Jackson dependency upgrade, which required corresponding code updates to several open source plugins: Container Service and the ML plugin suite. You will need to update these alongside 1.8.6. Any custom plugins using Jackson should also be updated before installing 1.8.6. Running non-compatible plugins with XNAT 1.8.6 can cause XNAT to fail to start up, and the failure may not be obviously apparent in logs.
See: Troubleshooting the XNAT 1.8.6 upgrade and plugin compatibility
Each of these critical bugfixes is included in the optional XNAT 18.104.22.168 Release , which is available for production sites that need to resolve issues with plugins specified above.