I launched minecraft 1.18.1 (java edition) with one mod called optifine and i saw that there was a beach that was as big as a mini desert biome when I pressed f3 to confirm that it was a beach biome it did say beach. I then went into the vanilla version of minecraft and put the seed in and the bug/error was there. I also looked around the area for something simular that happened or any other bugs. and then found the same thing not to far from the original error I also saw that in a swamp biome all the water was swamp water but in the middle of the water was a patch of bright blue water. The seed is : 139326837881205963
Swamp water bug: X 604 Z 95
Large beach biomes: X -101 Z -337
(By the way this world was not converted from older versions it is a brand new world that I just started up)