Bone mealing crimson nylium used to produce an average of ~15 crimson roots, warped and crimson fungus, per bone meal. This was sufficient to make a bone meal profit when recycled through a composter. As of 1.18.x the yield from bone mealing crimson nylium is reduced to around 7-8 nether plants and a bone meal profit is no longer possible.

This breaks nylium-based bone meal farms. No change to the crimson nylium has been included in any changelogs, so this may be a bug.