Discovered while testing MC-207410.

Note: In this ticket, "flowing fluid" refers to fluids moving within the world and changing shape. It does not refer to fluid which is in a consistent "flowing" state such as a waterfall.

The bug

Sculk sensors are intended to detect physical motion. When fluids start flowing and changing shape in the world, this is a very simple example of physical motion, howeer sculk sensors do not detect it.

How to reproduce

1. Place or locate a sculk sensor
2. Place a water bucket such that there are exactly eight blocks between the placed water source and the sculk sensor. This is so that the placement of the initial source is not in range and is not detected, but the resultant flowing fluids are within range.
3. Note the sculk sensor

Expected results

As the fluid moves, vibrations would be produced and the sculk sensor would pick up on this.

Actual results

It remains completely oblivious.