Bonemeal doesn't work on Superflat

I was making a build when I realized bone meal doesn't work on Superflat worlds. I tried in a default world and it works. The second attempt was on vanilla 1.21 but in the Superflat world, I was using Fabric 1.21

When bone mealing a block a sapling was in, it fertalizes but it's only 1 block

Anything else won't work