FIX: fix a bug in the reduce method

[maxcapodi78]

Description

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Issue linked

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Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.22%. Comparing base (8dd5579) to head (a814fc2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6204   +/-   ##
=======================================
  Coverage   85.22%   85.22%           
=======================================
  Files         170      170           
  Lines       64168    64168           
=======================================
  Hits        54687    54687           
  Misses       9481     9481           

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