fix: function output field should not be inserted as dynamic field

[shanghaikid]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.24%. Comparing base (1415a5b) to head (807fb5b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #380   +/-   ##
=======================================
  Coverage   97.23%   97.24%           
=======================================
  Files          43       43           
  Lines        2786     2791    +5     
  Branches      669      673    +4     
=======================================
+ Hits         2709     2714    +5     
  Misses         77       77           

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