Here it is, it has something to do with indenting (TAB)
(viz https://i.gyazo.com/a39c31e76b02b7842317ae9b89b22fc8.gif )
Made a new line, hit CTRL+Z (2 lines disapeared), hit CTRL+SHIFT+Z (only one
line appeared)

When there is no indent all works fine:
(viz https://i.gyazo.com/f2093fc6307d93cb19bfcfc3669cae8c.gif )

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