[Fix] Potentially access the wrong key when there are multiple parameter groups

[kozistr]

Problem (Why?)

Fixes #442

Solution (What/How?)

• add group idx too

Other changes (bug fixes, small refactors)

N/A

Notes

N/A

Checklist

• Make sure to run make format before commit
• My code adheres to the style guidelines of this project (make check shows no errors)
• Both new and existing unit tests pass successfully on my local environment by running make test
• I have made the necessary changes to the documentation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (1375069) to head (d464866).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #465   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          120       120           
  Lines        11028     11028           
=========================================
  Hits         11028     11028           

Flag	Coverage Δ
3.10	100.00% <100.00%> (?)
3.11	100.00% <100.00%> (?)
3.12	100.00% <100.00%> (ø)
3.13	100.00% <100.00%> (?)
3.14	100.00% <100.00%> (?)
3.8	99.99% <100.00%> (ø)
3.9	99.99% <100.00%> (?)

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