fix: buffer reset issue in io.Reader with content length enabled and release v2.16.1

[jeevatkm]

fixes #917

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.70%. Comparing base (feedf18) to head (253540b).
Report is 3 commits behind head on v2.

Additional details and impacted files

@@           Coverage Diff           @@
##               v2     #918   +/-   ##
=======================================
  Coverage   95.69%   95.70%           
=======================================
  Files          14       14           
  Lines        2206     2211    +5     
=======================================
+ Hits         2111     2116    +5     
  Misses         71       71           
  Partials       24       24           

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