In domain mode non existing log subhandler is saved to attributes.

When you in domain mode in created async handler add non existing sub handler to attributes it is successfully saved. In standalone mode it is not possible (subhandler is not saved - saving operation failed).
1.Run EAP in domain mode (default profile)
2.Create async handler
3.Try to add non existing subhandler to async handler attributes
4.Try the same in standalone mode with standalone-full-ha profile