fix: key/value format with whitespace separator should not be used

[gaius-qi]

Description

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.54%. Comparing base (b4493b2) to head (d76c351).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3459      +/-   ##
==========================================
- Coverage   52.54%   52.54%   -0.01%     
==========================================
  Files         194      194              
  Lines       20601    20601              
==========================================
- Hits        10825    10824       -1     
  Misses       8964     8964              
- Partials      812      813       +1     

Flag	Coverage Δ
unittests	52.54% <ø> (-0.01%)	⬇️

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see 3 files with indirect coverage changes