Texteditor nano does not work in the console window

[embix]

How to reproduce

1. open https://ohmygit.blinry.org/
2. in the console: nano file.txt
3. add some text, say "content" - every letter is followed by a newline, using the cursor keys does not work as expected
4. ctrl-x to save and enter - if you try to use another filename, the first letter is followed by a newline and the editor exits...