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Fixed regression in joined eager loading introduced in 1.3.0b3 via 🎫`4468` where the ability to create a joined option across a :func:`.with_polymorphic` into a polymorphic subclass using :meth:`.RelationshipProperty.of_type` and then further along regular mapped relationships would fail as the polymorphic subclass would not add itself to the load path in a way that could be located by the loader strategy. A tweak has been made to resolve this scenario. Fixes: #5082 Change-Id: I1c7b8d70ed94436c655e433bf34394b13d384c35