The cleanup only looked at the copies the master lists. With a replica
offline the listed copies can be empty and quiet while the missing one
still holds data, and deleting them would leave that copy as the only
one when it returns. Low-disk replicas now report readOnlyCanDelete and
pass the eligibility check, which made this reachable for more volumes.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>