Failed to notarize a "distribution" pkg

I believe that this is related to the post https://developer.apple.com/forums/thread/790880.

I essentially have the same problem that they did. I submit my Distribution PKG for notarization but the notarization fails and when I attempt to install the PKG user the UI I get a "External component packages (3) trustLevel=0 (trust evaluation failed; treating as invalid due to higher trust level for parent product archive)"

However if I install using "sudo installer -verboseR -pkg ConcealDistribution.pkg -target /" everything works as expected.

The difference between me and the other post is that when I expand my PKG using pkgutil --expand I do not have a Resources folder within my top level distribution. Instead my structure looks like

ConcealDistribution
	├── Distribution
	├── ConcealConnect.pkg
	├── ConcealBrowse.pkg
	└── ConcealUpdate.pkg

The specific notary service errors I receive are as follows

{
  "logFormatVersion": 1,
  "jobId": "7e30e3fd-1739-497c-a02e-64fbe357221d",
  "status": "Invalid",
  "statusSummary": "Archive contains critical validation errors",
  "statusCode": 4000,
  "archiveFilename": "ConcealDistribution.pkg",
  "uploadDate": "2025-10-08T19:41:33.491Z",
  "sha256": "40aacfacf25c6da0be8fe31ae9c145a25ddf9ed1f38be714687c74d95b26619d",
  "ticketContents": null,
  "issues": [
    {
      "severity": "error",
      "code": null,
      "path": "ConcealDistribution.pkg",
      "message": "Package ConcealDistribution.pkg has no signed executables or bundles. No tickets can be generated.",
      "docUrl": null,
      "architecture": null
    },
    {
      "severity": "warning",
      "code": null,
      "path": "ConcealDistribution.pkg",
      "message": "The contents of the package at ConcealDistribution.pkg could not be extracted.",
      "docUrl": null,
      "architecture": null
    }
  ]
}

For what its worth all the inner PKGs have their executables signed, the PKGs are signed themselves and they are all notarized and stapled without issue. Then I am attempting to sign and notarize the outer PKG and that is where the problems pop up.

Additionally I'm not sure when this stopped working as I expected but just a few months ago I was able to do this exact same process and install with the UI and have it work.