I believe this one has been reported, but still worth adding your report to make sure - Contact Us — Conan Exiles Help Center
Today all the map markings vanished, in both EL and Siptah. I can only see my bed and whichever follower I pick to view. The adventure continues… We’re still in beta
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happened to me some days ago… its kindda sad and i have no will to play the game anymore… hope they fix it…