Apparently this was actually the expected behavior, since new monthly channels 
were created for the non-ESR releases.
Reference: 
https://forum.snapcraft.io/t/request-monthly-track-for-thunderbird/47874 

** Changed in: thunderbird (Ubuntu)
     Assignee: (unassigned) => Deron Johnson (deronj)

** Changed in: thunderbird (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/2118577

Title:
  latest/candidate snap went backwards from version 141.0-3 to
  128.13.0esr-3

Status in thunderbird package in Ubuntu:
  Fix Released

Bug description:
  1) The release of Ubuntu you are using: 25.04
  2) The version of the package you are using: 141.0-3 snap
  3) What you expected to happen: 'snap refresh' does not install older version
  4) What happened instead: 'snap refresh' downgraded version to 128.13.0esr-3

  On 23 July 2025, the latest/candidate channel of the thunderbird snap
  version went to backwards from 141.0-3 to 128.13.0esr-3. Was this
  intentional? I assume not since there is now a set of ESR channels,
  and that the latest channels should follow the non-ESR path.

  For now the workaround is to run 'snap revert thunderbird' to get back
  to the 141.0-3 version.

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