Hello @Arnold MIshaev ,
Thanks for your query. Please refer to the following post for troubleshooting:
1.It turns out that having the hostname of the computer greater than 14 characters is the cause of this issue.
Default printer change upon RDP re-connection to terminal server: https://learn.microsoft.com/en-us/answers/questions/65924/default-printer-change-upon-rdp-re-connection-to-t.html
RDS 2019 Default printer changed after reconnected user session: https://learn.microsoft.com/en-us/answers/questions/214365/rds-2019-default-printer-changed-after-reconnected.html
2.The solution of MicrobyteSolutions on Friday, December 4, 2015 1:52 PM seems to be working:
Windows 2012 R2 printers showing twice (and unable to set default printer): https://social.technet.microsoft.com/Forums/en-US/ea51c54b-2734-4987-9f4a-a79f755c8153/windows-2012-r2-printers-showing-twice-and-unable-to-set-default-printer?forum=winserverTS
RDS 2019 - default printer changes after reconnect: https://community.spiceworks.com/topic/2243184-rds-2019-default-printer-changes-after-reconnect
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