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Starting from JMeter version 3.2 the maximum amount of sample results View Results Tree listener can display is limited to 500
. So if you have > 500 sample results in .jtl file it might be the case that failed samplers were discarded.
Try adding the next line to user.properties file:
view.results.tree.max_results=0
and restarting JMeter. Then open .jtl results file in View Results Tree listener - you should see all the results including failed ones.
See JMeter Properties Reference - Miscellaneous configuration for more details.