copying file content broken in 5.13.1

I have updated to version 5.13.1 (build 8265). Now when I connect to remote linux server, open nagios configuration file with around 650 lines of code, select "Ctrl+A" then "Ctrl+C" and paste in a local notepad only 170 to 180 lines get copied. Tried with multiple files.

Thanks for your report. What version of WinSCP were you using previously? Are you opening the file in WinSCP internal editor? Do you have the problem with that specific file only? Or with other files too?

I don't remember which version number was previously but it was 5.XX, probably last stable release before 5.13.
I was using WinSCP internal editor and it happened with all files

Scan you please try to downgrade to previous version to check, which was the last working one?
https://sourceforge.net/projects/winscp/files/WinSCP/