Bacula 15 on Debian 13: zstd and xxh3 not working?

Hello,

after using sha1 and lzo I tried to configure xxh3_64 and zstd1 as
a replacement.
The config is accepted from the director however it looks like
neigter xxh3 nor zstd is working:

...
13-Jun 14:17 backup-fd JobId 84970: Warning: XXH3_64 digest digest initialization failed
13-Jun 14:17 backup-fd JobId 84970: Error: crypto.c:655 Unsupported digest type: 7
13-Jun 14:17 backup-fd JobId 84970: Warning: XXH3_64 digest digest initialization failed
13-Jun 14:17 backup-fd JobId 84970: Error: crypto.c:655 Unsupported digest type: 7
...
   FD Bytes Written:       260,941,064 (260.9 MB)
   SD Bytes Written:       261,022,162 (261.0 MB)
   Rate:                   17396.1 KB/s
   Software Compression:   None
   Comm Line Compression:  None
   Snapshot/VSS:           no
   Encryption:             yes
   Accurate:               yes
...

zstd looks like linked but no xxh3:
root@backup:~# ldd /usr/sbin/bacula-fd | grep -E "zstd|xx"
         libzstd.so.1 => /lib/x86_64-linux-gnu/libzstd.so.1 (0x00007ff028a46000)

Any suggestions?

Cheers,
Pierre