Undiscovered treasure maps are not included in terrain updates

Does the same issue happen in a new world with the same seed?
What were the coordinates where you found the map and searched for the treasure?
What is the world seed?

Please avoid using "slang" terms in the summary as that does not help in searching. It is better to briefly state the incorrect result instead.

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Making a new world with the same seed (2122021) and there's not even an ocean there...

Map was in the chest behind the door of a 3 chest ship wreck (-1702, 40, -1891) visible in image, as being so close to where you find the map also seemed not "working as intended"

Based on comment that this does not happen in a new world, this is being resolved as Cannot Reproduce. If you can recreate the issue in a new world, please create a new report and provlde the world seed, coordinates where the map was found, and coordinates where treasure was expected, all from the same new world.

It is likely that the chunks where you found the map were from a previous version and were already generated, however, the new chunks were generated from the new version and so did not have the treasure or match the map.

It's more a matter of "typing the seed shown now generates a completely different world" - or "the seed someone types in is translated into a variable string that isn't displayed for someone to retype", but I'll change the title to be more accurate.