Nylium can spread under water or lava by using bone meal

Summary:
When using bone meal on netherrack that is next to nylium under water or lava, the nylium spreads, unlike Java Edition.

Steps to Reproduce:

1. Place nylium under water or lava
2. Place netherrack next to the nylium
3. Use bone meal on the netherrack

Observed Results:
The nylium spreads.

Expected Results:
The nylium should not spread.

Video:
Minecraft 2020-11-16 08-04-19.mp4