Trouble with Samba 4.23 after 14.4 -> 15.1 upgrade

Hello.

I'm heavily using Samba and I use Nagios to monitor it: a script 
periodically writes a file to a dedicated share and deletes it, so I'm 
informed early of any failure.

After upgrading a 14.4 machine to a 15.1 this started to fail.
Notice my fileserver is in a jail.

I tracked this down to the following:
> smbclient -m smb2 -W domain -U user //server/share password
> Try "help" to get a list of possible commands.
> smb: \> put testfile
> putting file testfile as \testfile (2411.4 kb/s) (average 2411.5 kb/s)
> smb: \> ls
> NT_STATUS_CONNECTION_DISCONNECTED listing \*
> smb: \> 

 > smbclient -m smb2 -W domain -U user //server/share password
 > Try "help" to get a list of possible commands.
 > smb: \> ls
 > NT_STATUS_CONNECTION_DISCONNECTED listing \*
 > smb: \>

Going the fileserver side:
> root@fileserver:/share
> ls
> testfile
> lsextattr user testfile
> testfile	DOSATTRIB

Now the interesting thing:
> rmextattr user DOSATTRIB testfile

Back to the client:
 > smbclient -m smb2 -W domain -U user //server/share password
 > Try "help" to get a list of possible commands.
 > smb: \> ls
>   .                                   D        0  Tue Jul 14 11:23:11 2026
>   ..                                  D        0  Tue Jul 14 11:23:11 2026
>   testfile                            N    22224  Tue Jul 14 11:23:11 2026
> 
> 		949166087 blocks of size 1024. 948339257 blocks available




So, having a file with DOSATTRIB seems to break smbclient.
This didn't happen on 14.4.

Before I start digging into the logs and getting mad with gdb, does 
anyone have any hypotesis?
What has changed between 14.4 and 15.1 WRT extended attributes on ZFS?

  bye & Thanks
	av.