Fix bug in update index levels

[znicholls]

Description

Checklist

Please confirm that this pull request has done the following:

• Tests added
• Documentation added (where applicable)
• Changelog item added to changelog/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.86%. Comparing base (b2132f0) to head (c92ddce).
Report is 73 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #14   +/-   ##
=======================================
  Coverage   96.86%   96.86%           
=======================================
  Files          23       23           
  Lines        1180     1182    +2     
  Branches      128      129    +1     
=======================================
+ Hits         1143     1145    +2     
  Misses         22       22           
  Partials       15       15           

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