Cannot create "Yum: Staging Generate Metadata Capability"

Appears that the UI is incorrectly posting a String representation of the intended DTO.

Reproduction

• Create a Staging Profile
• from System -> Capabilities -> Create Capability select the "Yum: Staging Generate Metadata Capability"
• select the new Staging Profile
• possibly intentional, possibly bad UX, but you must enable this Capability in order to save it
• observe that the request is rejected and the error message shown by field validation indicates that it cannot recognize the repoId being passed: "Staging Profile '[object Object]' could not be found"

Same problem occurs for "Yum: Staging Merge Metadata" capability definition.