What's the issue you encountered?

^

How can the issue be reproduced?

enter nether and go to undergrowth biome

Logs

No response

Mod Version

1.18.1-15.0.0.104

Additional information

No response

Closed since this isn't really an "issue." Mushrooms also generate on the bedrock layer in vanilla Nether biomes, and since sprouts can be placed on pretty much any block, it's expected that they'd generate there.