I've also found that if you have an extremely large paragraph, it doesn't work either.
Posted under General
Yes there are no line breaks before or after the text so it would not work. see forum #58882
That's kinda awful, and will continue to result in people inadvertently posting spoilers in the open. The OP matches what I've encountered in the wild, and is how a person would use the thing intuitively. If the fix is to serve any purpose, it needs to fix the actually important case, not something nobody will ever type.