I have just planned my next 14 days and wanted to share the plan on my blog in case people wanted to meet up. I saved the blog as public and then published the link https://canalplan.uk/cgi-bin/canal.cgi?current_state=loaded&lm=itin on my blog http://nbharnser.blogspot.com/2021/05/fazeley-junction.html
When people click this link there is no route just a notice saying there must be a start point and an end. When I am logged on to canalplan and go down the menu to load the saved blog the same link is used and it works OK
So you go to save the route - choosing to make it public with no key.
(https://canalplan.org.uk/forums.old/img/members/20960/mini_r1.png) (https://canalplan.org.uk/forums.old/img/members/20960/r1.png)
and it gives you this
(https://canalplan.org.uk/forums.old/img/members/20960/mini_r2.png) (https://canalplan.org.uk/forums.old/img/members/20960/r2.png)
which gives you this link
https://canalplan.org.uk/journey/11225_cp
But it does look like following that link sometimes doesn't bring the route up properly if you are not logged in.
So its probably worth logging as a bug - which I have done