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`read_barrier(session2)` was supposed to ensure `node2` has caught up on schema before a CL=ALL write. But `patient_cql_connection(node2)` creates a cluster-aware driver session `(TokenAwarePolicy(DCAwareRoundRobinPolicy()))` that can route the barrier CQL statement to any node — not necessarily `node2`. If the barrier runs on `node1` or `node3` (which already have the new schema), it's a no-op, and `node2` remains stale, thus the observed `WriteFailure`. The fix is to switch to `patient_exclusive_cql_connection(node2)`, which uses `WhiteListRoundRobinPolicy([node2_ip])` to pin all CQL to `node2`. This is already the established pattern used by other tests in the same file. Fixes: SCYLLADB-1139 No need to backport yet, appeared only on master. Closes scylladb/scylladb#29151