dajac opened a new pull request, #21309:
URL: https://github.com/apache/kafka/pull/21309

   Apply the same fix for Share groups. The 
throwIfShareGroupMemberEpochIsInvalid method was rejecting epoch=0 for existing 
members, preventing fenced members from rejoining.
   
   Changes:
   - Add early return for receivedMemberEpoch=0 in Share group validation
   - Add unit test testShareGroupMemberCanRejoinWithEpochZero
   - Add integration test in ShareGroupHeartbeatRequestTest
   


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