Der Noise Generator funktioniert an den Chunkborders oft noch nicht ganz richtig.
Die Chunks laufen nicht flüssig ineinander über, teilweise sind brüche in der Welt.
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First example doesn't really look like a noise generator issue, in fact it looks perfectly normal to me.
Second example is MC-125033.
Apart from that, for world generation issues, always include seed and coordinates please. We also only accept tickets in English.