Fix bug with fixed_input_parameters missing input params in symbols

[MarcBerliner]

Description

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Fixes # (issue)

Type of change

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Important checks:

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• No style issues: nox -s pre-commit
• All tests pass: nox -s tests
• The documentation builds: nox -s doctests
• Code is commented for hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.64%. Comparing base (154b192) to head (71a86d2).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5321      +/-   ##
===========================================
- Coverage    98.66%   98.64%   -0.03%     
===========================================
  Files          323      323              
  Lines        28062    28063       +1     
===========================================
- Hits         27687    27682       -5     
- Misses         375      381       +6     

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