When creating a conversion host via enable_queue, the associated task needs to include the params that were sent to create it so that it can be retried via the UI. At the moment, no contextual data is set. To replicate, create a conversion host via the enable_queue method and inspect the associated task.
https://github.com/ManageIQ/manageiq/pull/18541
resource data shown in task Configuring a conversion_host: operation=enable resource=(name: env-rhv43-02.cfme2.lab.eng.rdu2.redhat.com type: ManageIQ::Providers::Redhat::InfraManager::Host id: 4) Verified in 5.11.0.4.20190514210444_0c91ee1