To also add the experimental rule engine to the list, I also had to issue the following command:
bundle:start-level org.eclipse.smarthome.automation.module.script.rulesupport 90
(?) Does anyone know in which config file these settings are stored so we can make these settings persist on updates, until the Openhab dev team finished the refactoring work in https://github.com/eclipse/smarthome/issues/1896?