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The linked host agent's SMART merge falls back to matching a Proxmox disk by device path, and a path names a slot, not a disk. When a disk is swapped before the agent reports again, or after the agent went silent and kept its last rows, the row for the old disk matched the replacement. It filled or, for SAS, promoted the old serial onto it, which keyed the replacement to the old disk's canonical resource and metric history, and lent it the old disk's temperature and failed health. For SAS the registry's same-path join did the same at the canonical level even when monitoring kept the rows apart. Both now refuse a row whose identity contradicts the disk's, judged only on what both producers report like for like. WWNs count for every disk. Serials count only where Proxmox's serial is the drive's own, as smartctl's is: NVMe namespaces, and disks presented with SCSI vendor "ATA", whose serial udev's ata_id reads from IDENTIFY. Elsewhere Proxmox's serial may be a SAS address, a SCSI designator or a USB bridge's own serial (#1595). Reporter spellings are not disagreement: udev writes whitespace in serials as underscores, its T10 designator for an ATA drive puts "ATA" and the model before the drive serial, and its ID_WWN keeps only the first 64 bits of an NAA 6 identifier. The WWN match step compares normalized identity too, so the agent's 5-c50-a1b2c3d4 spelling finds the Proxmox 0x5000c500a1b2c3d4 disk. Proxmox's disk inventory reports a serial or WWN udev cannot read as the literal "unknown". The poller recorded it as a collected serial, so the collection state hid the gap and the agent's serial never filled it. It is now recorded as empty, and retained evidence carries only a usable previous serial so an older record cannot restore it. Identity keys already ignored the placeholder.