I jumped into the water while passing by a swamp biome. The water was only 1 block high. When I landed in the sand below the water, the "splash" sound disappeared and instead the sand one played.
What I expected to happen:
Both water and the sand sound effects were supposed to play.
What actually happened was:
The water sound doesn't play at all and instead the sand one played.
Steps to reproduce:
1. Find shallow water (1 block high)
2. Jump into the water.
3. When landing, hear the sound that plays.
Note: It also happens with any other block that is below sand. Like dirt, gravel or any other block.