volume.tier.download downloaded every replica from the remote tier and let
the last one in the master's location list delete the shared object, so a
replica missing from that list kept reading a deleted object.
Download onto one replica, copy it over every other remote-backed replica,
re-read the topology so replicas that show up meanwhile are replaced too,
and only then delete the last remote-backed replica together with the
object before copying the local volume onto it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
