Steps to reproduce

1. Make a bubble column.
2. Place a water source so that water flows over the top of the bubble column.
3. Look closely at the water flow over the bubble column.

Expected result

Bubbles only appear in actual bubble column blocks, not in and above horizontally flowing water above a bubble column.

Observed result

Bubbles appear in the entire block space where water flows over the top of the bubble column.

When putting flowing water over a water column, the water column particles exceed the flowing water without being a water column.