fix: avoid parsing generationExpressions as JSON

[rtyler]

These are not supposed to be JSON strings as per protocol

Fixes #3326

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.45%. Comparing base (da75777) to head (d2a57b7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3632      +/-   ##
==========================================
+ Coverage   75.41%   75.45%   +0.03%     
==========================================
  Files         146      146              
  Lines       44923    44901      -22     
  Branches    44923    44901      -22     
==========================================
+ Hits        33879    33880       +1     
+ Misses       9224     9204      -20     
+ Partials     1820     1817       -3     

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