I am having this same issue. Right now it’s the capture device HUD and scoring HUD. It will not show up even in the private map. If I log in as a different user/ new player then that screen displays it as it should.
On another map I have a custom HUD widget for health that will not display even on private island. If I log in as new player it works. With this one even if I fully publish the map the HUD is missing for that one player I developed the map with.
It feels like the accounts I develop with and have tested the island with prior to adding the HUD elements will NOT display them. However, the new accounts that visit the map post publishing of the HUD elements does see them. ugh…