When bonemealing a netherrack block to crimson/warped nylium, the green particles cover a large area of blocks around the affected block, though only a single netherrack is being affected.
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We're tracking this issue in MC-175170, so this ticket is being resolved and linked as a duplicate.
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The particles show the area of effect, even if it's not a valid location for something to spawn, so this is very likely to be intended.