Soft hyphens not working in Writer

The way I understand this document is that if I enter ctrl + -, I should get a soft hyphen that would break the word when needed. This is not happening. Some character is added, but the word is not broken even if needed. Only if I enter a hyphen that is always visible (-) the word breaks when the line ends. Is this supposed to be like this? How am I supposed to enter a soft hyphen, that would only appear as hyphen when word needs to be broken into two lines?

Using Windows 7, Writer

Please look, whether inserting works, when you use menu Insert > Formatting mark > Optional Hyphen.
It works here with LO4.2.1.1.