Can confirm this issue in 1.19.0. Found a shipwreck in an ice spikes biome with no buried treasure nearby. The chest takes 10 seconds to open and then generates an empty map labeled "Buried Treasure Map"
Currently on the latest Minecraft 1.12.2, a clean install with no modifications. MacOSX. I can confirm this problem still occurs. I'm still able to reproduce the issue. It has not been resolved.
Can confirm this issue in 1.19.0. Found a shipwreck in an ice spikes biome with no buried treasure nearby. The chest takes 10 seconds to open and then generates an empty map labeled "Buried Treasure Map"