Fix some bugs related to FunnelMaxStepAggregationFunction

[Jackie-Jiang]

Fix some bugs in newly introduced #13176

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 36.84211% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 62.15%. Comparing base (59551e4) to head (65b0472).
Report is 498 commits behind head on master.

Files	Patch %	Lines
...ction/funnel/FunnelMaxStepAggregationFunction.java	0.00%	11 Missing ⚠️
...y/aggregation/function/funnel/FunnelStepEvent.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13228      +/-   ##
============================================
+ Coverage     61.75%   62.15%   +0.40%     
+ Complexity      207      198       -9     
============================================
  Files          2436     2534      +98     
  Lines        133233   139009    +5776     
  Branches      20636    21537     +901     
============================================
+ Hits          82274    86404    +4130     
- Misses        44911    46140    +1229     
- Partials       6048     6465     +417     

Flag	Coverage Δ
custom-integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration	<0.01% <0.00%> (-0.01%)	⬇️
integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration2	0.00% <0.00%> (ø)
java-11	62.13% <36.84%> (+0.42%)	⬆️
java-21	62.03% <36.84%> (+0.40%)	⬆️
skip-bytebuffers-false	62.14% <36.84%> (+0.39%)	⬆️
skip-bytebuffers-true	62.00% <36.84%> (+34.27%)	⬆️
temurin	62.15% <36.84%> (+0.40%)	⬆️
unittests	62.15% <36.84%> (+0.40%)	⬆️
unittests1	46.68% <36.84%> (-0.21%)	⬇️
unittests2	27.81% <0.00%> (+0.08%)	⬆️

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