A few double passives are defensible—e.g.:
“Offerings in compliance with Regulation D are not required to be registered with the SEC under the Securities Act.”
As Ernest Gowers (FMEU2 at 139) noted: “In legal or quasi-legal language this construction may sometimes unexceptionable:
Diplomatic privilege applies only to such things as are done or omitted to be done in the course of a person’s official duties.
Motion made: that the words proposed to be left out stand part of the Question”
But these are of a different kind from are sought to be included and are attempted to be refuted, which can be easily remedied by recasting. The principle is that if the first passive-voice construction can be made active—leaving the passive infinitive intact—the sentence is correctly formed.
ACTIVE: Expect/＊omit somebody to do something
PASSIVE: Something is expected/＊omitted to be done (by somebody)