Default Region Adapters not registered by Prism

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I am currently upgrading the Prism library of an application, going from version 7.0 to 8.1. We use MEF to extend the application, and the older version of Prism had built-in support for MEF. Going to 8.1 we need do some implementation to adapt Prism to MEF, and that is fine. However, the default region adapters that Prism provides are not being registered with the Prism container extension, unless I do that by myself. Later during the bootstrapping Prism tries to resolve them, but that fails, since they are not registered. How come they are not registered at any time, or have I missed something else?

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