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This only applies the base-prefix rewrite on MS containers, but the
--external-msflow creates the instance from FE-1 instead. In that pathFE.docker_env()setsAUTO_CREATE_INSTANCE=1and carries the user env through unchanged, theninit_fe.shcallscreate_doris_instance, which sends${DORIS_CLOUD_PREFIX}directly as the storage prefix. So--env DORIS_CLOUD_PREFIX=baseworks for a normal cloud cluster asbase/doris_docker_env_..., but an external-MS cluster stores everything under justbase, causing different external-MS clusters that share the same bucket/base to collide. Please share this prefix composition with the FE auto-create path, or otherwise ensure the generated per-cluster suffix is applied before FE-1 creates the instance.