[Bug 2130492] [NEW] amd64v3 build failure: "E: dsc: amd64 not in arch list or does not match any arch wildcards: all -- skipping"

[Oibaf]

Public bug reported:

I tried building lto-disabled package in my PPA on current ubuntu
resolute, and while it builds fine on amd64, it fails on amd64v3 with
this error:

E: dsc: amd64 not in arch list or does not match any arch wildcards: all
-- skipping

Full build log:
https://launchpadlibrarian.net/828568501/buildlog_ubuntu-resolute-
amd64v3.lto-disabled-list_71+disableall_BUILDING.txt.gz

** Affects: dpkg (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2130492

Title:
  amd64v3 build failure: "E: dsc: amd64 not in arch list or does not
  match any arch wildcards: all -- skipping"

Status in dpkg package in Ubuntu:
  New

Bug description:
  I tried building lto-disabled package in my PPA on current ubuntu
  resolute, and while it builds fine on amd64, it fails on amd64v3 with
  this error:

  E: dsc: amd64 not in arch list or does not match any arch wildcards:
  all -- skipping

  Full build log:
  https://launchpadlibrarian.net/828568501/buildlog_ubuntu-resolute-
  amd64v3.lto-disabled-list_71+disableall_BUILDING.txt.gz

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