Insert point into route

I created a dangerous location point (in the web planner) and added it to the route. When I try to save, I get a message saying that route warnings aren't currently supported in the app and that I should share the route via the link. Okay, but when I access this link on my phone with the app, I get an error message...

https://link.locusmap.app/t/2t8ecm

So how should I integrate this warning into the navigation via the app?

Apart from that, I corrected this point via the app because of a typo in the name - and now the point has disappeared?!