I renamed a page called דוחות to דו"חות and things went wrong from that point. It seems the pages index got corrupted somehow, and the page is not linkable anymore, even after I rename it back.
Notice I used a double quotation mark character, in order to represent a special Hebrew Gershaim symbol (https://en.wikipedia.org/wiki/Gershayim).
I think the Wix editor code does not sanitizes the user input sting for page title, thus it allows inserting of characters which break the internal data structures (probably JSON).
I would kindly ask Wix developers to have a look at my site and check whether my assumption is correct.