Hi Perry,
This is a limitation of the current experimental status of the CommonUI/EnhancedInput integration, as we don’t have the same level of support for EI input actions as we did for actions defined in the CommonUI CommonInputActionDatabase. We’re currently hoping to improve this integration for 5.6, though the improvements may end up coming a bit later depending on priorities. Part of that planned work includes fixing the issue you describe:
When UCommonUIActionRouterBase::RegisterUIActionBinding is called with an enhanced InputAction, it will need to bind to an EnhancedInputComponent with intermediate bindings that in-turn trigger OnExecuteAction, OnHoldActionProgressed, OnHoldActionPressed, OnHoldActionReleased on FUIActionBindingBest,
Cody