Swamp doesn't generate in large biomes worlds

/locatebiome only searches for biomes within a square of 12801×12801 blocks area, so it's likely that some biomes aren't within the radius in large biome worlds, try with a new world or teleport somewhere else and check if there's a swamp biome

Generated a handful of large biomes worlds and was never able to locate swamp from spawn, but could locate every other biome I tried

It could be that this is related to the height the command was used at. I found swamp biomes on the three amplified worlds I generated, even when travelling 100,000 chunks.