When using s3: "error: Flusher group error: failed to flush packer: put object: no tomes available"

[plaffitt]

Describe the bug

When backuping to s3 (backblaze in my case), in some cases (I'm not sure when), creating a backup results in a "flusher group error". No backup is found then (but the s3 bucket contains the 1.5 GB from the below example).

This doesn't happen when using the local filesystem.

To Reproduce

$ plakar at @backblaze create
repository passphrase:
repository passphrase (confirm):
$ plakar at @backblaze backup ~/.config
[...]
40deac5e: OK ✓ /home
40deac5e: OK ✓ /
error: Flusher group error: failed to flush packer: put object: no tomes available
info: backup: created unsigned snapshot 40deac5e of size 4.2 GB in 48.225362598s (wrote 1.5 GB)
$ plakar at @backblaze ls
$

Expected behavior

I don't want this error to happen, or at least be more understandable so I can do something about it (or maybe I'm just ignorant but what is a tome?)

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: ubuntu 24.04
• plakar version: 1.0.2