Backup incomplete Netmiko on RouterOS 6.49

Hi,

I have a netmiko script that collects the configuration of a lot of Mikrotik devices via SSH (more than 300 devices)
It runs 'export' command and saves the output to a file for each device

I noticed the 'export' command is being interrupted on 6.49 version (6.47 and 6.48 are ok)

Attachments show details:

only 7 lines collected (export incomplete)

only 20 lines collected (export incomplete)

only 14 lines collected (export incomplete)