if sequence counters don't increase properly, call it a bad image

[jmbhughes]

If the sequence counter skips around, then it's a faulty image

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.85%. Comparing base (71cb591) to head (ba8d365).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #90   +/-   ##
=======================================
  Coverage   89.85%   89.85%           
=======================================
  Files          16       16           
  Lines         779      779           
=======================================
  Hits          700      700           
  Misses         79       79           

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