Can't save changes on NE8K X8

[zombah]

Hello,
While trying to save changes on NetEngine 8000 X8 version 8.230 i always receive error:
ReadTimeout: Pattern not detected: '<.+>' in output. while commit.
With debug enabled i see this:

I0430 01:26:02.204735 139636576620672 base_connection.py:650] read_channel: Warning: Are you sure to save the conf
iguration to cfcard:/config_20250430_0126.cfg? [Y/N]:                                                             
I0430 01:26:02.205096 139636576620672 base_connection.py:128] write_channel: b'y\n'                               
I0430 01:26:02.205313 139636576620672 base_connection.py:650] read_channel:                                       
I0430 01:26:02.215726 139636576620672 base_connection.py:650] read_channel: y                                     
                                                                                                                  
I0430 01:26:02.215955 139636576620672 base_connection.py:739] Pattern found: (y) y                                
I0430 01:26:02.241399 139636576620672 base_connection.py:650] read_channel: Now saving the current configuration t
o the slot 9                                                                                                      
I0430 01:26:02.266746 139636576620672 base_connection.py:650] read_channel:                                       
I0430 01:26:02.292051 139636576620672 base_connection.py:650] read_channel:                                       
I0430 01:26:02.317360 139636576620672 base_connection.py:650] read_channel:                                       
I0430 01:26:02.342684 139636576620672 base_connection.py:650] read_channel:                                       
Info: Save the configuration successfully.                                                                        
                                                                                                                  
I0430 01:26:02.368163 139636576620672 base_connection.py:650] read_channel: Warning: Are you sure to save the conf
iguration to slave#cfcard:/config_20250430_0126.cfg? [Y/N]:                                                       
I0430 01:26:02.393613 139636576620672 base_connection.py:650] read_channel:
...

then ReadTimeout.
Looks like save to slave#cfcard not detected somehow.