FakeVim: command o triggers folding of enclosing code block

• Position cursor at some line inside some braces-block
• Press key o
• The expected behavior is:
  • an empty line is added below that line,
  • the cursor is moved to the new line,
  • edit mode is entered.
• The observed behavior is:
  • an empty line is added below that line,
  • enclosing braces-block is folded,
  • the cursor is moved to where the new line would be if folding did not happen,
  • edit mode is entered.

Such behavior was not observed in version 4.11.x.

This should not be related to key bindings, because I have Command-< for this purpose.