Upgrading from Galactic to Humble

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Hi all, I am trying to upgrade my ROS2 project from Galactic to Humble. Unfortunately, due to the size of the project I am facing an immense number of errors, most of them related to missing dependencies such as

/opt/ros/humble/include/rclcpp/rclcpp/qos_overriding_options.hpp:28:10: fatal error: rcl_interfaces/msg/set_parameters_result.hpp: No such file or directory

This is usually solved by adding some lines to the CMakeList file (which means the errors is probably valid) such as -

find_package(rcl_interfaces REQUIRED)

${rcl_interfaces_INCLUDE_DIRS}

What I failed to understand is why everything worked just find with Galactic, while Humble keeps popping those missing header errors. They should have been missing with Galactic, too. Am I doing something wrong?

Thanks!