Thanks for that extra information. The problem is a bug in python-apt:
https://bugs.launchpad.net/ubuntu/+source/python-apt/+bug/2070432.

I.e., many of your .list entries use the [signed-by= ] option as you
noted earlier. But, python-apt does not know how to parse all of the
valid options in the one-line format. Hence, the source gets marked
'invalid' by python-apt, and ubuntu-release-upgrader does not migrate it
(it does not make sense to migrate invalid source entries).

The reason google-chrome.list and slack.list are correclty migrated is
that they do not use the [signed-by= ] option.

** Also affects: python-apt (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Confirmed

** Changed in: python-apt (Ubuntu)
       Status: New => Confirmed

** Tags added: rls-nn-incoming

** Also affects: python-apt (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Also affects: ubuntu-release-upgrader (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Also affects: python-apt (Ubuntu Oracular)
   Importance: Undecided
       Status: New

** Also affects: ubuntu-release-upgrader (Ubuntu Oracular)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2086506

Title:
  Upgrade to 24.10 deletes unmigrated apt sources

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