In Minecraft Java, when using Bone Flour in a biome (other than tropical) only sea grasses are born.
But in Bedrock Minecraft, using bone meal also generates coral 'plants' (not just tropical biomes).
I did a test in several biomes (it's a recent world) and the bug is real.

Some examples:
In the ice biome:

In another biome that I can not remember the name: