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I created 2 worlds as an example. One who created on the day the DLC started, and the other - today. And the naked eye can see that iron in the old world (where the map search was performed) was generated very rarely. At the same time, the ore generation settings were standard, so technically there are no differences in ore spawning in the world, but we see this
I wouldn’t really like to lose the progress of the old world, but life is hard

Thanks for the report. This shouldn't happen, ore generation wasn't changed. It is possible water prevented iron placement, but that is normal in randomly generated maps.

Perhaps, but on a similar map (I tried it a couple of times) the iron appeared as usual, often just stuck in the water and the like. And here it appears far from the spawn, I haven’t looked in the north yet, but the nearest one begins to appear only in the west, more than a kilometer away (approximately, I count on the rails)