The pinned 1.40 client can't recreate containers that use newer-API features (VolumeOptions.Subpath needs 1.45), which silently deleted the sonarr container on its watchtower update (2026-07-05). Unset = the nicholas-fedor fork negotiates the daemon's max API version per host. Fleet-wide sweep. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>