Fix off by one error with kafka parsing

[grcevski]

Backport of #1252

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.10%. Comparing base (6eccfa3) to head (d7a6c3d).

Additional details and impacted files

@@             Coverage Diff              @@
##           release-1.8    #1253   +/-   ##
============================================
  Coverage        82.10%   82.10%           
============================================
  Files              140      140           
  Lines            11604    11604           
============================================
+ Hits              9527     9528    +1     
  Misses            1554     1554           
+ Partials           523      522    -1     

Flag	Coverage Δ
integration-test	57.92% <0.00%> (-0.09%)	⬇️
k8s-integration-test	59.31% <0.00%> (+0.01%)	⬆️
oats-test	37.07% <100.00%> (ø)
unittests	52.38% <100.00%> (ø)

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