v.25.12Bug Fix (user-visible misbehavior in an official stable release)

Fix possible logical error upon receiving another

Official CH changelog text
Fix possible logical error upon receiving another read request from a replica after a response with the finish=true flag was sent. This was possible due to a logical race condition within MergeTreeReadPoolParallelReplicas, although it was very unlikely to occur. #90921 (Nikita Taranov).
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