the wrong info here was rather misleading, especially when encountering errors
just talking about "blobs" when the actual problem is with a chunk.
chunks did originally have their own magic values, but that got removed in
4ee8f53d07 "remove DataChunk file format - use DataBlob instead"
back in 2019, before the 0.1.1 release(!)
Reported-by: Dominik Csapak <d.csapak@proxmox.com>
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>