I was in a desert checking out the new stuff and I saw something weird. A firefly bush I checked the biome with f3 and said it was a river biome
MC-280140
I found firefly bushes in the new snapshot 25w06 not in a swamp biome
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From the 25w05a changelog(https://www.minecraft.net/en-us/article/minecraft-snapshot-25w05a):
The Firefly Bush is found in Swamps and near Rivers