Amvault hangs while trying to vault backups from holding disk.

Hi all,

I have a setup where I have a holding disk and vtapes. Then I try to use
amvault to copy the latest full backups to tape.
This works if I use amvault's --fulls-only with --src-storage parameter
and use the vtapes as the source.
But if I try to vault backups that are still on the holding disk by
using --latest-fulls. Amvault tries to copy the first full to tape but
hangs indefinitely.

The full redacted command line is
sudo -u backup amvault --dest-storage tapelibrary --latest-fulls backupset

Here's the relevant part of the redacted log file.

ma loka 11 09:23:13.626028751 2021: pid 1126324: thd-0x562b5502a400:
amvault: Amanda::Taper::Scan::traditional result: 'redacted-vault-1014'
on tape:/dev/nst0 slot 8, mode 2
ma loka 11 09:23:13.627741696 2021: pid 1126324: thd-0x562b5502a400:
amvault:
/usr/lib/x86_64-linux-gnu/amanda/perl/Amanda/Vault.pm:1196:info:2500017
Reading '/backup/amanda/holding/20211004180502/<redacted>._.0': FILE:
date 20211004180502 host <redacted> disk / lev 0 comp .gz program
/bin/tar crypt enc client_encrypt /usr/sbin/amcrypt-ossl
client_decrypt_option -d
ma loka 11 09:23:13.627958672 2021: pid 1126324: thd-0x562b5502a400:
amvault: Amanda::Recovery::Clerk: successfully located holding file for
recovery
ma loka 11 09:23:13.628001640 2021: pid 1126324: thd-0x562b5502a400:
amvault: start_recovery called
ma loka 11 09:23:13.628634814 2021: pid 1126324: thd-0x562b5502a400:
amvault: Amanda::Taper::Scribe preparing to write, part size 0, using
LEOM detection (no caching) (splitter)  (LEOM supported)
ma loka 11 09:23:13.639842536 2021: pid 1126324: thd-0x562b5502a400:
amvault: Starting <Xfer@0x562b572a4850
(<XferSourceHolding@0x562b57f15010> ->
<XferDestTaperSplitter@0x562b57fdf060>)>
ma loka 11 09:23:13.639865559 2021: pid 1126324: thd-0x562b5502a400:
amvault: Final linkage: <XferSourceHolding@0x562b57f15010> -(MEM_RING)->
<XferDestTaperSplitter@0x562b57fdf060>
ma loka 11 09:23:13.639986931 2021: pid 1126324: thd-0x562b5502a400:
amvault: Amanda::Recovery::Clerk: starting recovery
ma loka 11 09:23:13.641060521 2021: pid 1126324: thd-0x562b5502a400:
amvault: start_recovery called

And then nothing.

Is this a bug or am I doing something wrong?

Kind regards,
Rami Lehti