fix: Fixed handling of Pino merging object

[jsumners-nr]

This PR resolves #2595.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.18%. Comparing base (d169546) to head (59151cb).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2600      +/-   ##
==========================================
- Coverage   97.23%   97.18%   -0.05%     
==========================================
  Files         291      291              
  Lines       45932    45940       +8     
==========================================
- Hits        44661    44647      -14     
- Misses       1271     1293      +22     

Flag	Coverage Δ
integration-tests-cjs-18.x	74.17% <0.00%> (-0.02%)	⬇️
integration-tests-cjs-20.x	74.18% <0.00%> (-0.02%)	⬇️
integration-tests-cjs-22.x	74.22% <0.00%> (-0.02%)	⬇️
integration-tests-esm-18.x	49.68% <0.00%> (-0.01%)	⬇️
integration-tests-esm-20.x	49.68% <0.00%> (-0.01%)	⬇️
integration-tests-esm-22.x	49.71% <0.00%> (-0.01%)	⬇️
unit-tests-18.x	88.86% <0.00%> (-0.02%)	⬇️
unit-tests-20.x	88.86% <0.00%> (-0.02%)	⬇️
unit-tests-22.x	88.87% <0.00%> (-0.02%)	⬇️
versioned-tests-18.x	78.96% <100.00%> (-0.18%)	⬇️
versioned-tests-20.x	78.96% <100.00%> (-0.18%)	⬇️
versioned-tests-22.x	78.97% <100.00%> (-0.18%)	⬇️

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