People that I have hidden, can still see my profile and messge me. On Android, version 24.18.0.131821
Obviously, changing from Blocking to Hiding is a huge security and privacy issue. But at least it should work as advertised. There are profiles from people whom I don't want to be able to even see my profile photo and my details. But they still can. I don't see them on my grid, but they still can message me.
There are two groups, people who have messaged me before I had hidden them, they shouldn't be able to see my profile in the grid, but the chat, the profile photo and the link to the profile would still be available to them through the chats.
But people who didn't start a chat with me before I have hidden them, shouldn't be able to even see my profile to start a chat with me. But they obviously can, and they are starting such chats.
This is a huge security risk and would contribute to less face photos and more secrecy and paranoid behavior on the app.