andyhuangdev opened a new pull request, #23430:
URL: https://github.com/apache/kafka/pull/23430

   Description
   
   The controller can acknowledge a SCRAM credential update before brokers 
apply it. Starting clients during this window can cause authentication failures 
and terminate the background consumer task, leaving the test waiting for a 
consumer group that never forms.
   
   Wait for the credentials to appear in each broker’s cache before starting 
the consumer and admin client.
   
   Testing
   
   - Reproduced the failure by delaying broker-side credential publication with 
a debugger.
   - Verified the fix with the same delay.
   - All four tests in `ConsumerGroupCommandSaslAuthenticationTest` pass with 
breakpoints disabled.
   


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