fix: issue 299

[victoraugustolls]

This pull request fixes issue #299 by checking if a field was already processed by its original name and not by the name given through a tag.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.08%. Comparing base (13acb69) to head (f7a8d01).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #304   +/-   ##
=======================================
  Coverage   95.07%   95.08%           
=======================================
  Files          19       19           
  Lines        2742     2744    +2     
=======================================
+ Hits         2607     2609    +2     
  Misses         98       98           
  Partials       37       37           

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